Yeah, this is from an AU where Anakin sides with Mace Windu and kills Palpatine during the events of Episode III, thus ensuring the Jedi and Republic live on. Meanwhile Tarkin and other Palpatine loyalists flee, eventually forming an Empire-like organization out of the CIS called the Galactic Dominion. The visuals for this AU tend to follow the themes you see here; combining prequel and OT aesthetics while also giving it a more angular look.
Thanks for pointing me towards your freighter by the way, I really like it! I hope Adam uploads it here as well.