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Imperial Fist chapter tactics give centurion devastator squad tank hunter

A unit of centurion devastator squad with grav cannons and grav amps rerolls failed armor pen with the grav amp, however a dice is only allowed to be re-rolled once, so the tank hunter perk is useless for this kit.

Is that correct?

If you re-read the graviton rule you see that Grav weapons don't roll for armour penetration, so the tank hunter perk doesn't really do anything for them

Good point, I guess it is technically different than armor pen.

Thanks!

Nothing "technical" about it.
It is just like how an Armour save, a Cover save and an Invulnerable save are different things. The end effect (prevention of a wound/damage roll) and part of the procedure (roll a single die for each hit) might be the same, but they are still different things with different rules affecting them.

The squad still gets hurri-bolters or MLs, so the tank-Hunter rule helps there anyway.