Yes and no. Yes since he already has the Third True Magic, and no since his two other attributes are catching up to it yet. He's already an equivalent, though, since he could use most of his powers without much repercussion (thanks to materialized soul).

It was explained throughout the story that it is just an act; that their "deaths" has something to do with their plans for the future. In short, they are not really enemies. Both of them are on the same side.

I share the same sentiment. But, that future was set over 40 years later into the story. By that time, I believe that every single story in One Punch Man would have been over (considering that everything up to the latest chapter in the manga happened in a short time). Thus, I made him one (his case is similar to the Endgame Rimuru who became absurdly overpowered at the end of Tensura).

Assuming that God from OPM is creator level is logical as Garou was once able to reverse time. God should be way stronger.

Yup. The train of thought continues there. As someone who could have been able to defeat such being, how strong would Saitama be (in the future)? That's why his power is made unclear yet has a certain threshold.

By that logic, does that mean beyonder creators doesn't have to be omnicient, omnipotent, and omnipresent? They just have to be powerful beyond the norms of the universe? Like Saitama can't warp reality or manipulate it

Not really. "Injured" is a better way to put it (which is why he used his final trump card moments before the attack).

There will be one later. Apologies if I can't do the usual daily updates but uni is killing me lately. It'll return during times when I am not that busy irl.

What can beyond creator level entities do?

Definitely one of the strongest fictional characters out there. Her lone ability to remain "impervious/immortal" is enough to let her do so, not to mention her destructive powers that modifies the existence of something, such as turning your body into a sea of petals. The anime made her seem underwhelming, but she isn't like that upon further inspection.
Basically, she soloes her own verse.

As for Beyond creator entities, they are made to be a step up from creator-class, the ones who can "edit" reality itself at their whims. It is supposed to be the highest class attainable, but Beyond Creator classes are the ones who surpassed this limit. For once, they are no longer affected by low-tier attacks.

(Altair was being "harmed" due to the birdcage that turns her vulnerable; see this article for more details: https://topstrongest.fandom.com/wiki/User_blog:RM97/Re:Creators_Explanation_Blog#Altair)

Next thing that they can do is to affect "reality" as a whole. If you know about "Mysteries", "Creator", or the strong ones in Lovecraft such as "Azatoth", that's what I'm talking about. They can do more things, but it'll be kept secret until I publish the future chapters ;)

Depends. From the way things are stated, their power levels are vague. However, it is repeatedly foreshadowed that the Outer Gods there has a great amount of similarities with Lovecraftian Mythos. I recall seeing a giant eye in one of the trailers which reminds me of Cthulhu. That's why I'm currently treading on the Lovecraftian Mythos when it comes to the plot in my fic.

Merry Christmas too!

I didn't even notice this lmao!