Various spells being less effective is quite a big of a gap from the "invalidate" claim - after all, there might not always be a ledge and your barbarian might not be swinging them shortswords either. Sleep is arguable, because on one hand it's potentially less powerful, but on the other hand it's guaranteed effect now with set HP - you know exactly what you're getting - there is a lot of value in that in RNGfest that is D&D. They might further increase it though, which imo they could by adding another flat 6 hit points base and rank up, but that's what EA is for.
Same goes for many other spells that might be affected - they will either amend them, buff them or simply let them stay as is and the world won't end.
Ah now I see we're getting to semantics. Okay:
Invalidate - "make (an argument, statement, or theory) unsound or erroneous."
It is the absolutely correct term. Your argument is with the dictionary.