Just don't send your coins to him and you'll be fine. This is essentially the gold scam from 1929 allover again, where people deposited their gold to the bank only to later find out that the bank had printed cash out of thin air, meaning that their cash wasn't backed by gold as they where promised.

Study the protocol and whitepaper, compile from source and only use open-source coins, wallets and miners. Don't trust Bill Gates.