"In Europe you'd also need a boatload of cash or a top private insurance if you'd choose the best private chemo therapist and clinic in the country outside the public health system where Walter would be on long waiting lists if he were in Europe."

This is extremely incorrect take. Ask anyone in France, Germany or the UK. The quality of outcome is extremely small between public and private even for the most complicated procedure. Perhaps in private you will get a better experience in terms of customer service.

In fact some of the most notable experts usually work for both the public medical sector and run their own clinic.

This is as incorrect as saying in Germany you have to go to a private university to get access to the best professors.

There are also loads of datapoint supporting the "fantasy" take of the series. For example loads of american only start going for certain cancer screening at age 65 when it becomes free, this can visibly be seen in the data where there is a sudden jump in detection at this age. Again, this kind of behaviour would sound very bizarre for most Europeans.