No it doesn't, this was way before stronger jutsu were introduced and power levels were quite levelled. Domu tanks all jutsu he faced in his lifetime but the thing is he hasn't faced Amaterasu which is considered the strongest physical attack by BZ, the one that witnessed every form and level of Rikudou feat.
Diamonds aren't immune to atomization that's a fact, TSB will disintegrate anything like Dust Release.
Diamonds aren't immune to nuclear explosions are they ? If not, any Jinchuuriki on B's level can kill him
Adamantium is harder than diamond
Amaterasu burns through chakra, Domu is made of chakra, it gets undone when the chakra burns away same way the fire undid Kabuto's jutsu
Gentle Fist only requires contact with the body, no piercing. And as I said before, it relies on chakra to be made, no chakra points means no Domu armour
Kusanagi is said to pierce through anything
