Sadly, it doesn't
Anything adding base attack damage such as Professor Kukui, Choice Band, Muscle Band etc. do not apply to the silent fear attack, because it has no base attack number and is raither placing damage counters! (You can see the difference with the Tapu Koko promo, choice band increases the damage done to the active because it has base attack damage).
Hopefully that clears things up for you! Matchups that don't go to well in your favour are things such as Darkrai and Zoroark, simply because of weakness. I'm not too fond of Volcanion either as they can OHKO your Trev BREAKS with a single steamup, and you regular Trev's with no steamup. I've also faced Tapu Koko GX in expanded, it was pretty annoying having all the spread damage counters being scooped up with AZ and SSU.
The main gimmick of this deck (and the most enjoyable part, in my opinion lol) is, getting a first turn Phantump, and then use Wally for Trev, getting a turn 1 itemlock with only 2 cards! It's satisfying asf.