There are plenty of Nobel laureates who well, do rest on their laurels and dive deep into pseudoscience after that.
Accomplishment in one field does not make one an expert, nor even particularly worth listening to, in any other. Certainly it doesn't remove the burden of proof or necessity to make an actual argument based on more then simply insisting something is true.
Careful with the scientism. The job of science is to explain the nature of reality, but we can only describe what we experience.
Not sure why you're being downvoted. It's such a common phenomenon that it has its own name: Nobelitis.
[0] https://en.wikipedia.org/wiki/Nobel_disease