As someone that works in a casino, this was a fun video to me. The owner actually has two casinos, and due to a series of events I won't bother explaining, each are designed differently. While they don't follow the rules to the tee, they still loosely fall into each of the explained categories in the video.
The one mostly following the playground design is by far the most popular. It gets roughly double the numbers to the gaming one. While regulars more or less stick to their thing in both, the gaming one has a hard time roping in new people to come regularly, while the playground seems to be appealing enough to have people become interested and want to come back (as long as they don't lose too much on the first visit.)
As an aside, most of the employees, myself included, also prefer the playground casino; the more open design makes keeping track of people easier and is just generally more pleasant to spend time in.
Also, for the clock thing; it actually works damn well. Sure, some have wristwatches, but most stick to only having their phones to check time, which they often don't check since that requires active effort while they're focused on the game. So yes, if they had a clock they could just glance at the wall to see, they'd definitely spend less time in the casino. Considering that we also get a lot of elderly customers that don't even have mobile phones, the effect is so much more.