Funnily enough, the Writer was bragging that Invincible could beat Superman in a fight and was gloating about how much better written Invincible was as a character.
Depends on which Superman he's facing. If it's the earlier versions where he's just a chump with extra strength who jumps high because he came from a high-gravity environment, then maybe. If it's the modern version of Superman who's nigh-indestructible and gets a massive power-up from the sun, then no. The man could probably bend the entire Viltrumite race into folding chairs while still having enough strength to pump babies into Lois Lane.
The guy seems like a Vito-tier dickhead complete with Soy beard.
https://youtube.com/watch?v=1MBI9IRc3_I
No wonder the politics surrounding Viltrum's takeover is so fucking surface-level that it might as well been written by a high schooler with the education level of the typical American who flunks history class. Just one look at the guy and I can tell he barely had an idea how European colonialism worked, especially since he based the Viltrumites on a blend of colonial/imperial attitudes and Social Darwinism.
Empires are not so easily won or fought; if anything, with how few Viltrumites there are to cover so much space in the galaxy, they'd fail at trying to conquer Earth; they'd probably be better off signing an alliance with them instead to replicate their numbers with humans mating with Viltrumites and Viltrum giving Earth its tech and protection in return.
If you look into history, the colonial empires of Portugal, Britain, Spain, and France have a track record of signing treaties of alliances with native tribes for common gain. It wasn't just white boys rocking up to the neighborhood with guns and taking it over; they usually needed the brown people to help hold the territory because most of the white soldiers are busy fighting wars back home in Europe against each other. Hell, most of the ''Spanish Army'' that conquered the Americas consisted of Mesoamerican tribes with some Castilian boys organizing them into a proper fighting force. Even in the late stages of European colonialism, that was still the case; during the Estado Novo era, the Portuguese Empire's best soccer player and its most decorated soldier were both blacks.
If Viltrum's Empire was the least bit realistic, especially after that purge of theirs that wiped out most of their population, most of the Empire would consist of half-breed Viltrumites from a thousand different races, with pure Viltrumites being the tiny minority, as there's just not enough of them to rule a large, galactic empire. But given their DNA is pure enough to result in half-Viltrumite bastards coming from most sexual unions with aliens, that would lead to a scenario where you'd have no shortage of Viltrumites, so long as you're talking about Viltrumites with alien DNA. Mark and Omni-Man would go to Viltrum, only to see a thousand different alien species be represented there by their Viltrumite sons and daughters; children whom they had with their Viltrumite rulers, like how a lot of people in Latin America are part-Spanish mestizos and mulattos who are half-Spanish people with African or Mesoamerican DNA.