That's pretty much what remaster is.
It comes from music industry where remastering is just mixing audio channels with different settings.
Besides, Lara's boobs are round now, that's probably the main thing they wanted to update, lol.
Doesn't look like there will be any QOL updates - curious what, if any, could have been done? I remember trying to play the demo as a kid, and had a tough time with the arrow keys mimicing movement made for analog.
The original Tomb Raider was a relatively early 3D game, created in an era before analogue sticks, and it's a little awkward to control in modern hands. The remasters include the ability to switch back and forth between "classic and modern joystick control schemes", as well as camera lock-on