I was a bit puzzled initially by the phrasing as well, but I've listened to that podcast episode and what parent commenter means is that quiz shows in the UK (like Only Connect, Mastermind, etc.) are doing really well in the TV ratings.
I’m from the US as well and haven’t heard of this trend. Classic game shows however are all household names: Wheel of Fortune, Family Feud, The Price is Right, Jeopardy, and of course Who Wants To Be A Millionaire which captivated the entire country whenever it was on in the last 90s. The first one to make it to 1 million in price money was incredible.