I have binge-watched about 12 seasons so far. Having been in a similar industry, I can relate in the restructuring and reconditioning of rooms and the customer service side of things.
After seeing all those episodes, If I was the inspector and trying to convince the owners to make changes, two phrases come to mind.
One is from a TV show called Dr. Phil here in the U. S. where Dr. Phil often tries to change people fro the better. Aperson will explain their issues and DR. Phil will say "How is that working for you?". The idea being that they have a problem and have not done something to change it. This is also evident in this series. People don't want to change and think that even though they have no idea what they are doing, that they are in the right because they THINK they are smarter than the experts.
The second phrase I would tell the hoteliers is this "If you always do what you always did, you will always get what you always got!". This of course means that you have to change things to be able to control how they will be redirected.
Even making small changes to a menu to test its acceptance, or trying different pricing can make a world of difference. If you drop the prices of rooms until you are full, then slowly increase them to find the sweet spot.
I think the series does a good job showing these ideas but I just wish those two quotes were used to help convince the owners.