About Hidding Comment by JavaScript

Comments are a type of PDF annotation, and all annotation objects have a hidden property. So you can hide and show any annotation, as long as you know it's name.

Here's the JS reference entry for the Annot Object

Acrobat DC SDK Documentation

The annot name is created automatically. It is not accessible from the Acrobat UI. You can only get it with JavaScript. I would suggest using the "this.selectedAnnots" property to reset the names of your help annots, with this process.

1. Select a comment object on the PDF page

2. Run this code in the console window while the comment it selected.

this.selectedAnnots[0].name = "MyHelpName";

Then you can use the name to show the comment.

this.getAnnot("MyHelpName").hidden = false;