Why are all of the Tomb Raider games tagged as 2D on their store page? Please enlighten me.

Hmmm... I'm not sure where you're seeing this -- I can't see this tag. The original Tomb Raider 1 on GoG (not the remaster) has a software render mode that doesn't use '3D acceleration', T2 has a software render option in their setup dialog box, and T3 through T5 offer a "Core Design MMX Hardware Card Emulation" mode... all non- 3D accelerated options. Idk if that's what the tag is referring to. Though I imagine most people will use the 3D accelerated versions. Still, even in software rendering mode, the earlier TR games would be considered 3D games I would think! Strange.