Fuck, modding Oblivion Remastered was a complete pain in the ass, and surprisingly it wasn't Linux fault.
First you need to download dev version on MO2 which wasn't posted on github but on their discord server (and complete their introduction/humiliation ritual fucking shit). Secondly, you need to download OBSE64, UE4SS (don't know what this crap is) and OBSE plugin for loading UE4SS jesus fucking christ. And then you find out that they've updated the game in June and I have pirated release version, so I had to roll back OBSE and UE4SS I've downloaded... And since I'm using Lutris I can't associate nxm handling, so I have to manually download mods and add them through horrifying wine file picker...
Aside from that everything else works extremely well.