Maybe. I infer from Belkar's remark that Tarquin has fire resistance of some kind, and that this is why he didn't take fire damage. I also get the impression that Malack knows that he can safely target a Flamestrike over Tarquin, because he's protected anyway. That would imply that Tarquin is simply immune - not just on a successful saving throw.
So it is possible that Tarquin has resistance to divine energy as well (although I'm not aware of a way of getting that) or that The Giant overlooked that Flamestrikes deal damage that isn't fire.
Mind you, that isn't proven either. I'm just suggesting some alternatives, and I don't think the currnet comic proves he has Evasion.
Hm, so how would point buy work in-universe? Do newborn babies get to make a choice for their stats (and if so, why does Roy have stats that aren't good for a fighter)? Or perhaps their parents do (and if so, why didn't Eugene give his son stats that mandated a wizard class)? Do we have any remarks from The Giant about whether point buy exists in his world?