there aren't really any spread decks like delta or speed spread or rocklock in today's metagame- its mostly sniping. a few minor pearl breaths isn't like spreading 80 damage around and getting KOs ONLY through a spread attack.
with spintail, atm rock, delta, cursed stone, etc. you had a genuine spread deck, where you didn't take KOs until later in the game, and intended to spread damage around such that the spread itself would kill (not attacks like pearl breath where the 50 damage is the main damage output).
i think there is a definite difference. if your palkia had 2 spiritombs and like 4 crobats it might be considered more of a spread- but that's unlikely. normally the spread damage from pearl breath is used to set up KOs- not to take them, marking a distinct difference from a true spread deck IMO.
obama was the only true spread deck ive seen this year