Yeah, I get it.
I tried loading up an older save, in the hopes it might be near that point, but only had one just turned level 2.
Sorry couldn't be any help, but I am positive that I didn't go there unprompted.
It may have been dialogue, perhaps with the Mother. It may have been MC's thoughts. It may have been in-game notification when reaching level 3.
Any of those seem plausible, but I just can't remember the specifics.
Hopefully
Sycho can shed some light on it.
Do you know what information is given to players re the Training Room and needing to visit the couple to get the teacher?
Also, was there notification about visiting the other hotel, to meet Anikka?
I'm sure there was info provided in-game, to let players know, but can't remember what/where/how.