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First of all, I feel this should be obvious, but HA DIO's natural reaction speed should likely be "At least Massively FTL" instead of "At least FTL+". At multiple points throughout the game, he reacts to stands like Star Platinum and Crazy Diamond. The first hit anyone lands on him (Jotaro) is only done through a sucker punch, so it's not like he's shown to be immensely slower than these stands.
Secondly, it should be noted that DIO is not fully subject to paradoxical destruction. He isn't immune to it, but he resists it. When Jotaro uses the main timeline DIO's armlets on HA DIO, it does harm him, but Jotaro notes that his wounds are healing. This doesn't seem like the kind of thing that would happen if DIO wasn't somewhat resistant to paradoxes.
Finally, The World Over Heaven should probably be above Low 2-C via hax. His current Low 2-C is based not only on scaling from GER and Tusk Act 4, but also the assumption that DIO was only creating/altering a single timeline. However, this is heavily suggested to not be the case. During his final fight with Jotaro, DIO explicitly states that "by its very nature, there can only ever be one reality...", which suggests the "reality" he's altering is the entire JoJo multiverse/all timelines as opposed to just one.
This is further supported by HA DIO's victory over Funny Valentine. When DIO erases Valentine, he says, "Funny Valentine... You no longer exist...anywhere." Now anyone who has read Part VII knows that Valentine's Stand allows Valentine to hop between alternate universes and transfer his mind and Stand to the body of another Valentine before returning, essentially allowing him an endless supply of extra lives. DIO's statement of Valentine no longer existing anywhere and his earlier statement about how he never bothered to overwrite him completely because of his potential suggest that when DIO erased Funny Valentine, he did not just overwrite one timeline to have no Funny Valentine, but instead overwrote all timelines with Funny Valentine, completely wiping him out and making D4C useless.
Now the problem here is we don't know how many universes/timelines exist in JoJo, but since Valentine never seemed worried about running out of "lives" and shifted through quite a lot of parallel worlds, I think either "At least 2-C" or "Likely 2-B" would be more accurate for HA DIO's reality overwrite.
Secondly, it should be noted that DIO is not fully subject to paradoxical destruction. He isn't immune to it, but he resists it. When Jotaro uses the main timeline DIO's armlets on HA DIO, it does harm him, but Jotaro notes that his wounds are healing. This doesn't seem like the kind of thing that would happen if DIO wasn't somewhat resistant to paradoxes.
Finally, The World Over Heaven should probably be above Low 2-C via hax. His current Low 2-C is based not only on scaling from GER and Tusk Act 4, but also the assumption that DIO was only creating/altering a single timeline. However, this is heavily suggested to not be the case. During his final fight with Jotaro, DIO explicitly states that "by its very nature, there can only ever be one reality...", which suggests the "reality" he's altering is the entire JoJo multiverse/all timelines as opposed to just one.
This is further supported by HA DIO's victory over Funny Valentine. When DIO erases Valentine, he says, "Funny Valentine... You no longer exist...anywhere." Now anyone who has read Part VII knows that Valentine's Stand allows Valentine to hop between alternate universes and transfer his mind and Stand to the body of another Valentine before returning, essentially allowing him an endless supply of extra lives. DIO's statement of Valentine no longer existing anywhere and his earlier statement about how he never bothered to overwrite him completely because of his potential suggest that when DIO erased Funny Valentine, he did not just overwrite one timeline to have no Funny Valentine, but instead overwrote all timelines with Funny Valentine, completely wiping him out and making D4C useless.
Now the problem here is we don't know how many universes/timelines exist in JoJo, but since Valentine never seemed worried about running out of "lives" and shifted through quite a lot of parallel worlds, I think either "At least 2-C" or "Likely 2-B" would be more accurate for HA DIO's reality overwrite.