I've just found something out

a while ago I made a post about how portal doesn't work on newer macbooks because they don't support 32-bit games but I've just seen a video from 2 YEARS ago about portal with rtx and surely that would mean that they would've had to update the bits of the game? right? RIGHT? (I will admit I know nothing about how bits or bit rates work and I'm just guessing but my point still stands, how can they update the graphics of the game to use the full power of the 4090 but yet it still doesn't surpass 32-bits?