It's the very first "post" of the 'Perverted Forum' of Part 1. Back then it was just a throwaway scene to introduce the kinda things you would see in it, as Alice originally wasn't planned to be part of the game (Same with Liz), but after she was added there has been some debate around if this will indeed be retroactively applied to Alice's character (Aka she has been fucking around in VR because there is apparently this thinking that doing so in virtual reality isn't an issue in this world of Fujino), or if it will just be ignored despite Alice's model being used in it, hard to say at this point.