She's in a bathrobe, but yeah, that's the very end of the second game. It's completely pointless to the narrative, as the bad guys were already defeated and the artifact was recovered. It's just there to give you one last victory lap with all your weapons and do some teasing fanservice (even ending with Lara heading off to take a shower when it's all done, but not before shooting the camera out). And probably because the devs ran out of time to actually write and animate a proper conclusion, so they just threw one joke level together and called it quits.