If that were an accurate argument, I'd have been dead of lymphoma decades ago.
The man has cancer.
I do not think he, or anyone, would run if they thought they would die enroute to the finish line (which can be defined as either election day or 8 yrs 3 mos after election day). I can’t imagine that from anyone. It would make truly no sense at all. So I believe this is a rational thinking man and he is not concealing anything and believes he is healthy.
The problem is, and will continue to be, that everyone knows the man has cancer. It really doesn’t matter if he thinks he is well or not. It also doesn’t matter if tests are negative right now. The statistics for recurrence are what they are. Now, if there is something special about his variety of cancer that creates new statistics, then perhaps those need to be made clear.
But even beyond that . . . to win the Presidency he has to make his case to people who are not inclined to vote for him — that is, independents. They have to be persuaded. He will start out behind with them. They may only read enough to know he has cancer and not bother reading further.
This would seem a needless burden for the party’s nominee.