Look at that fucking wolf 
From what I can see it's the original level geometry with upscaled textures and some very unevenly updated models. In the middle screenshot the shotgun on Lara's back looks like the original square PS1 model while the handguns have been remodeled. The end result looks like Minecraft with one of those high res texture packs
Lara herself looks like she's from a 2006 game while I have no fucking clue what's going on with the wolf, it looks like some bizarre attempt at remaking the model while keeping the PS1 art style or something
Edit: The announcement on Steam is pure quality:
Tomb Raider I-III Remasters Launching Feb. 14,
2023
The remasters include all Expansions, secret levels, and updated graphics!
Lara Croft is back!
Aspyr and Crystal Dynamics have partnered to announce Tomb Raider I-III Remastered Starring Lara Croft, a new three-game bundle of the first three Tomb Raider titles (Tomb Raider, Tomb Raider II, Tomb Raider III), lovingly restored with upgraded graphics and performance enhancements, complete with all expansions and secret levels.
Available Feb. 14,
2024.
Yeah, games really couldn't do convincingly realistic human characters until much, much later. I recently rewatched some Grim Fandango videos and it hit me how brilliant the choice to have most of the cast be calaca figures was for the time period