Very possible, or he might be talking to an entity that is an impostor or parasite pretending to be this entity that is feeding off his desire to be special, or he might be telling the trusth and maybe this "pserheles " is just not that great. Or maybe it’s a servitor/egeregore. I wouldn’t say it’s that important: results are what matter.
We call this UPG (Unverified Personal Gnosis) around here. Until it’s verified by a couple of others independently finding the same info without being primed, then it’s “unverified” and you just take it that he believes it and don’t worry too much. Definitely don’t believe anything random unless you yourself experience it. You can be polite and all, but the we don’t know one way or the other.
I keep a bucket in my mind called the “that’s interesting” bucket, and stuff like this just goes in there and I hold off judgement until I get more info. Which may never come, but I don’t really act on things in the “that’s Interesting” bucket, they’re just curiosities.
Nothing. Wait and see if you get results or not: the proof of the pudding is in the eating. 
Do make sure your psychic protections and spiritual hygiene spiritual hygiene are on point, especially if you just evoked a random unknown and didn’t set up protections first… and start work on developing your astral senses, then when you can know you have a decent chance at detecting and avoiding impostors and parasites.
For reference:
The rules are here
The posting guidelines are here in the FAQ
The Terms of Service are here
No it doesn’t 
Definitely don’t allow a system to threaten you into “not leaving” whatever that means. Fuck him, if you think he’s deluded then his curses are in his imagination too. I’ve been “cursed” by a lot of delusional people: nothing happens, ever. Cussed out, yeah, real magick: they have NO idea.
If you don’t know what it’s supposed to do why did you do it?? Do you also eat weird looking food without asking what it is? Or pop pills without checking what they are and the side effects? yeah, don’t do that.
Take control of your sovereignty and be in charge of your energy, protect your energy, and it will protect you.
The most I can find is that he’s the fairly recent discovery (1 year ago-ish, 2022) by a user on reddit that has since been deleted. That users UPG seems to be verified by a couple of people, one of whom spammed his amazing success finding his… phone… with the entities help. I hope there’s more to him than that because that is completely underwhelming. Dunno, maybe he’s doing the rounds on discord or something.
The Wayback Machine luckily archive it here: https://web.archive.org/web/20220810133751/https://www.reddit.com/r/LeftHandPath/comments/wk78td/anybody_familiar_with_pserheles/
But who knows if that’s honest anyway. It may or may not be the “friend” mentioned by the OP - who you will notice posted this and then never came back, so it does look a bit…weak, for context.
This OP posted for only 2 weeks, didn’t read more than 7h, looked at all of 30 topics, their intro (you can see it from the profile - Rayan aka Tiffany was a newbie from Morocco), is like something out of manga (they wanted to walk on water too) and they may have left quickly just having realised that magick is a bit more involved than “hum a spell and hey presto”.
This is not the way to gain any kind trust for your magick being legit, to be honest.
As such, so far I wouldn’t pay any attention to “Pserheles”, not when there are so many time-tested entitles with great results people have reported in over and over again. I would say come back to this one when you have gained experience with approaches that are proven to work for thousands of mages over hundreds if not thousands of years - that will give you a decent baseline and then you’ll know what you’re dealing with with this unknown.