A square is never, ever, under any circumstances adjacent to itself.

So you can use this with his HSS correct?

That is correct.

Hes great for taking down characters hard to hit up close or range with no damage reducers.

He took out a DP Shang Chi without Shang Chi getting a swing in. Was a sad day for him. But he is vulnerable to range attacks. But he has thunderbolts which could partially help with that.

For clarity does this trait trigger Super Senses or the Mystic TA?

His trait is not an attack. So it can't be evaded by Super Senses and it doesn't trigger Mystics.