I'm not sure how you got introduced to this platform, but if anyone is interested in sending you BTC, they can send it directly to your address.
He probably got a spam message from a stranger/scammer in one of those social messaging apps like telegram or discordOP, the exchange is a scam. Avoid it at all costs.
They claim that their platform was created in 2021 and has one year experience, but this is not true according to whois domain database.
Quote
Domain: linbtc.com
Registrar: NameCheap, Inc.
Registered On: 2022-08-22
Expires On: 2023-08-22
Updated On: 2022-08-22
Registrar: NameCheap, Inc.
Registered On: 2022-08-22
Expires On: 2023-08-22
Updated On: 2022-08-22