Haha a 7% edge would be so ridiculously exploitable that no casino would consider dealing blackjack if it were regularly possible. Theoretically if you were counting cards and the count was ridiculously in your favor then for a single hand or two you could approach a 7% edge but by no means could you have that edge over any significant run of hands.
Not to mention that I'm sure that post is considering single deck blackjack which is barely spread anywhere anymore, and when it is the payout on a blackjack is 6-5 instead of 3-2 which steals another 1.4% of your equity on any given hand.
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