It's French, they probably were not sure how it's spelled in english so they just used they own language term.
Bro really went through all that trouble to find the weird O thingy just to spell a word wrong 💀
Probably native to their keyboard. I don't think English is this person's first language.
You mean a diareses? It's on most any phone keyboard now, and as said, this person is probably Fr*nch.