That 6 deck table is a marginal game that is deployed strictly as a "Counter Catcher"
I certainly respect the poster's "request for proof"
Proof is hard to come by when someone needs to "protect their sources", (not unlike an investigative journalist), does.
I will say this much: While counting cards (elsewhere) I briefly shared a BJ table with a young floorman from Turning Stone - who confirmed for me (away from the table) what I had suspected.
He despised Turning Stone's high level of Card Counter paranoia. We chatted over lunch. Once we noticed each other "playing to the count" it would have been foolish for us BOTH to continue at the same table.
T.S.'s Two-Deckers, (at least at higher stakes), are Counter Trap and I am only one of many who have been 86'd from there.
Rather than argue the point, for the sake of completeness on this topic, I will take a moment to describe the worst Counter Trap in existence.
In Atlantic City, a little known factoid is that there is ONE casino that offers Late Surrender.
You are REQUIRED to ask for it IN ADVANCE.
You are told that there will be a delay. You wait around.
They deal the game to you -- if you use Late Surrender correctly, you are immediately Half-Shoed and marked as an Advantage Player.
The Casino is the (always struggling) Trump Marina.