As soon as someone has it in their inventory and it's scanned it will be on the site.

Realistically it does not really matter in terms of trading, making a mobile site would be no different then if you just use the regular site on mobile other then the formatting perspective of it.

If he is trade banned, then how do you plan on trading him?

You just cannot trade known scammers on SteamRep, you should be fine.

Your price is your price, if you want to sell for that cheap then feel free to do so.

Try selling it for below the actual value, it should sell rather quickly. Rather then just deleting and getting nothing out of it.

If you were in fact hacked then you need to file a Steam Support ticket in order to regain control of your account.

https://support.steampowered.com/kb_article.php?ref=2347-qdfn-4366

Once you have regained access then you may appeal your ban on the site.

The forums are not a place to appeal site bans.

https://steamhost.cn/steamcommunity_com/groups/tf2outpost/discussions/0/810938082097571166/

Try using a different browser.

It is not possible as far as I am aware.