It does not come any truer than that. Blackjack started out as a single deck game. That is what it was built on. Back in the day blackjack was played on a single deck with a 3-2 payout for a natural. Nowadays you can almost never find that. Nowadays if you see a single deck game it means a 6-5 payout.
And that 6-5 payout is like a smack in the face for blackjack players. Here the casinos are touting that this a revival of the good ol