I suggest you to request Jot Touch 4 homepage to update its information on Goodnotes. The homepage describes Goodnotes doesn't support palm rejection with Jot Touch 4. However, Goodnotes support palm rejection, doesn't it?
I worried a lot before buying Jot Touch 4 today because the homepage says that Goodnotes doesn't support it. But I'm relieved now because I checked that palm rejection working in Goodnotes with Jot Touch 4.

If the homepage was updated, I wouldn't worried about it.