Yurchenko full on, lay full
Round-off 1/1 on, layout 1/1
Nikolina Tankoucheva (BUL)
Yes, this is a real vault that exists and that has been performed by a person in real life. That person is Nikolina Tankoucheva of Bulgaria, and the meet in question is qualification at the 2002 world championships, although you would not know that from the code of points, where her name is absent.
This vault actually has quite a competitive D score of 5.4, so someone actually performing it could put up some internationally competitive scores, but it’s so challenging (and you know it would get amplitude-destroyed in the E score), that learning an equally valued DTY has to make more sense, right?
In terms of naming, you will mostly still hear this style of vault referred to as Yurchenko full ons, though the requirement of a full twist onto the vault is a leftover from the vaulting horse day, and now a “full-on” vault simply requires 3/4 or more of twisting onto the vault to count—much like the Tsukahara requires at least a 1/4 twist. You can see this push and pull in the code image itself, where the verbal description says 3/4 turn, but the image depicts a full turn.