I’m too tired to play support right now, but you could create a (hidden) dummy project and test what happens to your own comments in the comment section when you make the switch.
Science! :)
Viewing post in Changing to discussion board
I was seeking help from itch.io admins.
I read that comments wont transfer when you change to discussion board. Well i might as well try it now as it seems that comments will still be there if i change it back.
https://itch.io/t/154101/question-about-switching-from-comments-to-discussion-bo...