>Block
Block has never been portrayed like that when it's not being used to prevent escape. Heck, the manga has it as a beam.
>Erasure
Firstly, while I know it's on the profile, idk where exactly that came from when it's never stated that it was spatiotemporal rather than existence. And weakened presence causing erasure as a stronger being, albeit gradual and limited, trumps WF's.
>Porygon
Sure, I'll give you that, as you're not wrong. Porygon is physical. What isn't though? Marowak's ghost. The Gastly line. The Misdreavous line. Giratina itself. You get where I'm going with this..
Furthermore, data and files in this case sounds like an existence, if how you described it lines up. Verse equalization hits that hard, unless you wanna say (and I'm saying this not to be sarcastic) that WF is data on a computer here, making this 2-C vs 11-A. Not really something out of Giratina's league.
>Distortion space being superior to a White Face
Place outside of space time > place after space time. Only one of them has been in that void like state from the beginning.
>Giratina stronger than the player
Handful of things. For starters, not close to High 2-A. Metafiction takes a middle finger to our system. I could go into detail (I don't want to though), so I'll say there's a reason that Undertale's player is tier 2 instead of tier 1 and we constantly shut down DBH upgrades. But even disregarding that, if WF can see the power behind this 2-C and be afraid enough to cost his life, same thing could be said to happen as he'd see true Giratina behind sealed, again, backed up with a supernatural level of fear inducement.
>Nullification
I know you didn't address this, but as Giratina can move and use passive abilities, it can still use its existence as antimatter itself to fashion a Heal Seed or Max Elixir, which cures exactly this ("Sealed" Moves). I wouldn't blame you if you said this is overextrapolation, so I'll say precog allows Giratina to do so before his active abilities get nulled.