What, you can organise a 1-player VS race on MKPC?

I do not know what this is for (similarly to TT but without mushrooms and at any CC), but by clicking on the Wiggler challenge and going back, the 1-player VS mode is back again.
Can you guys tell if it is an update on MKPC including that mode?

It may look hidden, because, normally, at first glance, it may not possible to do a VS game without NPCs (1-player), but it isn’t hidden because I’ve seen MKDS videos that a player can hop on a Action Replay code and do 100cc TT speedruns, for example.