As the founder of CryptoThrift, I can confirm that avax is indeed CoinTrade (CryptoThrift Username) and I'm stating such as we have received a correspondence from the seller to confirm the accounts are linked.
Cointrade is one of our very first users to sign up, you can see his account number is 462 and we're up to over 43,000 users now.

We encourage sellers such as CoinTrade/avax as we have had nothing but good stuff to hear about him from our buyers and his feedback on the site speaks for itself.