All this is true. The Scandinavians have always taken a particular interest in these matters and their studies, and others, show that pilots live longer than average, malignant melanoma is the only significant additional health risk factor and there is no significant difference in life expectancy between long-haul and short-haul pilots. I have never seen pressurisation cycles mentioned as a factor in any study.
However, it should be pointed out that these studies were done at a time when pilots retired at 55 or before, long-haul meant eight hours, not eighteen hours, and flight time limitations were a limit not a target.
It has always been the case that a flying career is all about looking after yourself and finding the type of work which suits you best and hurts the least. Sleep deficit is a problem in both long-haul and short-haul, although for different reasons. Ultimately it depends on being able to get sufficient quality sleep in the limited time available. That occurs best when you're relaxed and enjoying life but it becomes more difficult as you get older even though you may be relaxed and enjoying life. You are approaching that age. There is a chance that you could return to short-haul remembering how good it once felt, only to find now you are older the short-haul early starts are more difficult to cope with and your sleep deficit is actually worse.
It is still the case that older pilots tend to migrate to long-haul if they have a choice. To me that indicates that long-haul still has some merits. But whatever you decide to do, it is most likely that you will get the best quality sleep when you're doing the kind of work you like best. Apart from protecting yourself from the sun and preventing dehydration, there don't seem to be too many other health issues to worry about.