To me his writings were always part poetry, Greek mythology, politician, and then he gets to the science part. He is getting old, and maybe the science part is not so clear as you say, but that would beyond my experience level to determine.
I don’t mean the science part, or even the content specifically. It’s like a stream of consciousness first draft. Or note cards for a speech that we missed.
I don’t mean to be hard on the guy. But I am sure he is capable of a much better job. I hope he is OK.