He still has mechanical parts and the giant body frame with tornado surrounding him. If he clash with Tiamat (who can still leak infinite amount of Chaos Tide from 4D pocket dimension her body) there's always the risk of touching that mud from physical contact. I'd give him much higher chance than what they came up with, probably even able to damage her like Gorgon did too, but the moment he falls, you better get his gigantic body out of there or you'll probably end up with 2 kaijus to fight.
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Inb4 in the Tsuki remake they will reference the shit out of Tiamat.