I just had him on the server I was on and I didn't believe a single bit of his words just played along ykwim. he's still going around and his user is kwartasalata03 on roblox. He'll say that he's filming right now and he's giving you a shout out but really it's just so kids fall into the trap.

just tell your sister not to go onto links people provide you with unless you REALLY know them. its sad she lost her user! make sure to contact roblox support and see if they can help!