The artist is pretty into it and posts about perfume they bought or found interesting a lot, which probably influenced their decision to do those. It was also pretty early into the series.
Still not quite as jarring as when I checked the new posts from a different yuri artist I followed and it was ads for sex toys, though.
woah woah woah vocaloid reference in yuri? am i in heaven? have i been transported to the brainrot section of my brain without knowing? has a misterioue genie of sorts came and granted all of my greatest desires and wishes? WHAT IS HAPPENIGN!?!