Telling you when to play content is the definition of FOMO.
“You can only play this content on Sundays, but it will be available every Sunday forever” is always FOMO and always predatory.
I’m not re-defining anything.
Anything that meets that definition is always FOMO. Anything that does not meet that definition cannot possibly be. FOMO is controlling when players are allowed to experience(/buy) content in order to force them to play when you want them to. Any intentional time limited window is absolutely always FOMO.
Until it’s gone again. It does come back but you could miss out till then. Hence “fear of missing out”. I feel like you’re purposefully ignoring that it is FOMO.