Wanted to know something about steamtrades.com

My guess would be that the user deleted their ST account on their own. It is a big red flag imho.

Not sure about possible different wording between banned and users removed on own request. But even if it's just the latter, you could expect that the user doesn't want to be contacted because of trades on Steamtrades anymore.
To figure out the reputation of a user you should also check the account on other websites, e.g. https://steamrep.com/ and barter.vg.
Also - even though it relates to Steamtrades - calling out a user is forbidden. Thus you might want to blacken the account name in your picture.