I can confirm that delete hole is working on audio data. I just tried after reading this. I actually had to go to the manual and
carefully read how to do it. I honestly thought the feature was MIA because I delete data by dragging, right clicking and selecting delete. There's no delete special option if you drag to highlight and right click to bring up the menu.
Using the timeline and a higher level menu option are required. I'm feeling stupid again.
In my defence, I think the bakers should tweak this so that I can swipe across the data and access delete special by right clicking. No?