Yes, it is. You don't need something to follow to treat something as a precedent that not what the word means. The fact they did it sets the precedent they could do it again, even if no following game does. All a precedent means is an event or action that happened is considered for a future or current action. Diablo Immortal is by definition a precedent.
Yeah, Diablo isn't a fair pass, it is clear you aren't even reading my arguments at this point. A normal battle pass isn't fair. I literally said battle passes tend to be predatory. If you don't have the decency to read my argument, why do you bother replying? Most battle passes have inherent predatory behavior in them. A fair pass is one where a free player is treated the same as a paying player (ie capping both or not capping either) AND either everyone grinds or difference between grinding and paying is not huge. Or, if they want to cap free players and not paying, that battle passes aren't removed and you just constantly move to the next pass whenever you finished the one you were on.