The entire political press has just agreed that they shouldn't talk about this, so I suppose it's notable that the NYT has a piece by Dick Cheney's cardiologist:
Despite reassurances from the White House to the contrary, at times over the past year, the president has not looked well. I am not Mr. Trump’s doctor, and have only reviewed his records that have been made public. But Mr. Trump is probably the most photographed president in American history, and a variety of physical ailments are easy to see. He’s had large bruises on both hands, swelling in his legs and episodes when it appears that he is struggling to stay awake. He’s also had advanced imaging performed for unclear reasons. The public is again left to wonder whether the nation’s leader is OK.
I'm sure journalists justify their quiet by saying they shouldn't speculate, but when has that ever stopped them.
I also bet they have all been told "off the record" making it difficult for them to talk about it. One quick trick!