Ya, it seems you make an hourly "donation" to the charity to gain access to the table. It seems like it's been around for a while, donating to the right people.
I went Saturday. It's in the basement beside the performance area, where there was some UFC deal, coincidentally. Room is behind a locked door with a check in person controlling it. Buy a membership, buy your hours, both of which are charity donations. Waited to sit quite a bit longer than expected, but figured out the check in app should I go back. Games were pretty juicy and left with more $ than I went in with. Non-descript guy drinking a water by the door was probably acting as security. Dealers were all great.