There are 52 universes in the local multiverse
They're all grouped in bubble sets and there are more universes in each bubble set
When they say there are only 52 universes, they're referring to the local multiverse only
That already let's me know who made that thread doesn't understand something incredibly basic about the DC cosmology
The simple fact is, if this information were "incredibly basic" there'd be a direct scan available explaining it, yet this arrangement you are describing has never been shown in DC Comics. The "local" multiverse is the DC Multiverse, and that's a term that was only used once in Multiversity and then completely ignored in the Perpetua storyline.
Which when we talk about the multiverse afterward and we say "this" as in this one (implying more), it doesn't take an Einstein to realize what that means
In other words, "it doesn't take an Einstein to make the assumption I made." Calling the multiverse endless doesn't mean it has infinite universes, and even if it did, that one piece of information from a DeMatteis Phantom Stranger comic wouldn't override a dozen scans from Snyder saying otherwise, particularly since this is Snyder's character.
And this one literally talks about people coming from different universes after explaining how it's infinite"
Also to add on. Wouldnt "endless universes" be at least 2-B on its own?
1. Again, that context does not necessitate infinite universes, and even if it did, that wouldn't be superior evidence to the mother of the multiverse saying directly otherwise and her entire storyline hinging upon there being a finite number of universes.
2. Infinite universes would be 2-A, but there aren't infinite universes in DC.
I'm pretty sure saying that only a fraction of her power remains
That isn't what she said. She said "all but a fraction of my power has been returned to me." This means the amount of power between where she is now and her "full power" is relatively small.
Regardless, whatever hindrance she had went away as she was threatening to destroy the Multiverse during her fight with TDK.
She had received an amp prior to the fight, and there were only six universes left. That's 3 for her, 3 for TDK. Still 2-C.
Mxy himself has very very few feats of destroying a universe, and most of them are quite old.
that's just off the top of my head.
So your "too many examples" is two examples, of her threatening 6 universes in tandem with TDK, and scaling above a wildly inconsistent gag character in Mxy?