I'm no expert but I've decided to not pop it into neutral when driving downhill.
I suspect if it can't actually hurt the CVT it can't be good for it.

Also you are not charging when the system is designed to charge.
Perhaps the battery will suffer long term from being less charged.

I've decided to trust that Honda's engineers are smarter than me.
There are a million other no-risk things I do to get 60 MPG; I don't do this one.

Need fewer troops to support.
Drive a hybrid.
Best tank 71.65 MPG.

Before this car I spent two years learning hypermiling on my 2004 HCH1.