The no KYC advertisement is just a promotion and use that thing to take advantage to those people they think they can't do a KYC which is not true on their side(advertisement).

I heard many complaints about their service and I heard that they scam from this service.
Check this thread https://bitcointalk.org/index.php?topic=2041972.msg49067744#msg49067744

You can find someone already scam with their service.

If you want to exchange your coins without KYC I suggest you use the exchanges which is well-known and use by many people.

Look at the binance you can use their service without KYC but you only have 2btc limit for withdrawal.