Pothole Squad's first effect only stop Traps when it is Summoned (Gamea is wrong, it does not last a whole turn), so outside summoning window it no longer save you from TTH.
Pothole Squad's second effect only stops Trap Hole cards from being used when a monster is Summoned, but TTH can be activated anytime, it's not restricted to when a monster is summoned like other Trap Hole cards.
I'm questioning your "Reading Comprehension" skills.
"But this effect does not lasts for the turn this monster was Normal Summoned."
Read this phrase again, please.
Neither player can activate Trap Cards when this card is Normal Summoned.
Neither player can activate "Trap Hole" cards when a monster is Normal/Flip/Special Summoned.
While "Goblin Pothole Squad" is on the field, you can still activate "Chaos Trap Hole" against the Normal/Special Summon of a monster.
This is all the rulings for the card and btw chaos hole is dark trap hole just the JP name
Chaos Trap Hole is a different card to Dark Trap Hole (which got renamed to Darkfall because it's not a "Hole" card at all in Japan.) Chaos Trap Hole negates Summons, which is why Pothole Squad can't do anything about it. (It only prevents cards being used in response to already-successful Summons.)
Anoymous
ValleCula
