$100 for a decent game per Mehaffey https://www.*****************************/blog/central-las-vegas-strip-blackjack-2018-10488/ That's reasonably in line with my experience when I stayed there about 1.5 years ago
I think the answer is no. I am not familiar with the link Rumor posted. But from experience, I know Cosmo removed all DD games from the high limit rooms a couple years ago. If there are any remaining on the main floor, they are not pitch (and I would guess they are pretty bad rules)
When I was there in August, I’m 95% sure they had a $50 double deck game that was 3:2, H17, no DAS out on the main floor
I walked through Cosmo this afternoon and confirmed Sevjay's info. And to answer the OP's question, the DD games were not pitch and the posted limits were $5k