The user https://vrchat.com/home/user/usr_615a4795-c8e3-478e-8e78-82fa6abca194 does not appear to be in the website user search index. I've tried searching for "phio.alchemist", "動く城のフィオ", and "phio". While the "phio.alchemist" search finds plenty of alchemists, as well as a "phio.alchemist2", and the "phio" search finds some other phios, none of these searches return the user linked above. However, searching for 動く城のフィオ does find their worlds, from which the user profile is linked.