[the phantom]

He was pretty silly to blame the Noldor for the return of Morgoth. That makes no sense.

Morgoth's fortress was already there waiting for him and he obviously came back to it before the Noldor arrived. The Noldor merely chased after him (and if they wouldn't have then Eol would've found himself on the end of an orc spear before too long).

How could he think the Noldor somehow caused M's return? Did he think they approached him in Valinor and said "Hey, Morgy, let's bust out of this joint and go to Beleriand and then have a big war with each other" or something like that?

Plus, he called the Noldor "invaders and usurpers of our homes". The Noldor plopped down in regions where there weren't many people, so there weren't even any homes to invade even if they wanted to. I don't recall any tale of the Noldor attempting to move into a populated area and forcing the inhabitants to leave.

Eol was a silly, silly elf.