Um The Hammer was like a proto Death Star.
The Flaxan technology would be much more similar. Also, remember how the Flaxan guns outright disintegrated the people they shot? Star Wars blasters leave wounds.
Another thing is the fact that Ahsoka fucking dodged Shin’s starfighter lasers, and Viltrumites can move at hege speeds.
Don’t worry he’s part Asian. That definitely nerfed his size. Sure, Viltrumite genes are strong, but nothing is strong enough to fix Mark’s problem.