While PoBIT upgrades older F-16C’s to the same standard as the Block 70/72 it doesn’t get re-classified as a Block 70/72. IIRC I think they would be called Block 40/42/50/52 + like how the F-16I is the Block 52+.
But in-game they would be pretty much the same apart from the Block 70/72 having CFT’s.
Yeah it’s not really clear unlike the CJ and CM renaming. They might just not bother with renaming them since the PoBIT program is set to upgrade nearly all of the US fleet.