If there is an item that grants 5 I wonder if that article that said something like 70 levels 98 perks to choose was correct. Everyone said it was wrong, but if there are bonus perks here and there 5 from the artifact 1 from this quest, 1 from that dungeon getting 25ish perks from 150+ dungeons and god knows how many quests does not seem that impossible.
But we don't know if quests give us perks, do we? Even if they do, I suspect they would be quest-related perks, and not perk points for us to choose our own perks.
What's the basis for the seventy-something perks?