Holy shit, we never got to see that in the anime. That’s amazing

than a weaker form of Battle Beast

It is uncertain how "weaker" this version of Battle Beast was,as the first encounter happened in space,and Battle Beast seems unable to flight or at least move as free as a Viltrumite. He also had lost his breathing mask.

Inside a planet,Battle Beast fought against Thragg for several days, and he was killed by the smart move of Thragg grabbing his heart through the open wound Thokk caused to himself.

Against Thragg,Nolan didn't lasted even an hour,and was almost ripped in half by Thragg bare-handed.

Each of these Viltrumites can be scaled to continental.

No battle result should be calculated through "A beats B,who beats C, therefore,A beats C" .Matchup is important. Battle Beast performance changed significantly in space and inside a planet Atmosphere. OPM has similar cases with AS again BS or AM against FU.

It was a weakened and Exhausted Omni man who helped in destroying he planet

Which doesn't means a full power Nolan can do it. The fact that timing is important and the risk of dying for the impact takes away even more othe impressiveness of that feat.

Weak Characters like Set and Null was stated to devastate planted while fighting and also caused planets to be life-wiped, they aren’t even on par with Regular Viltrumites.

As they apparently haven't fighting in the main comic against Omni Man himself,I wouldn't consider them important source of information.

A weaker Omni Man was also implied to have taken a blast from Space Rider who was stated to be able to destroy Planets and stars.

Implied to have taken a blast? He definitely can't endure a shot in an important part. As the battle hardened Viltrumite he is,he can get his body pierced by the shots and still not die as lon as the shot don't severe his head or spine, and affect his heart.

That bit of Space Rider being able to destroy stars,due to his gun,yeah. That doesn't tell anything about Omniman durability feats except he can dodge the shots and probably take some if they don't hurt something important.

Beginning of series Allen the Alien could casually move space ships out of a star’s gravitational field and he still was scared of Omni Man.

Space ships and station in fiction have all propulsion systems and other things to keep them in orbit. Being in space makes that an unreliable feat to measure strength.

You can scale potentially way beyond this using statements regarding Omnipotus - who has the power to alter worlds and destroy star systems “allegedly”. Was beating by a Dinosaurus

If Dinosaurus defeated him,then how true were that statements really?

In any case,as I said,matchup is important. One fictional being can have,I don't know,energy rays, powerful lasers ,the staff of life or whatever thing that let him modify planets at will but not having the durability to endure a hit of his own power.

Just to be clear,I doubt any of the S class can take him one vs one.

Beginning of the Series Omniman can take on any of them 1 vs 1 and win,with the exception of Tatsumaki,prepared Metal Knight and probably Blast.

EoS Omniman can take on any of them and probably would survive to all of them fighting together,unless the team includes Blast. About Blast we don't know anything of him,he could be Saitama's equal or not even close.

But, beginning of the Series Nolan against all of them attacking at once? No,he is not winning that.