@CooperJ this has been going on for about 4 years, and various such things have been tried (slowly reversing, different sounds, etc), but they always seem to adapt.
The authorities won’t help. They seem utterly uninterested, and it is likely going to take human deaths to get them to act, or maybe not even that. There are some marine researchers trying to look into it, but it’s kinda small scale.
If the first people they kill are leisure boaters, then there will likely be a bigger push for action. If the first people they kill are fishermen, then I suspect we’ll just start seeing orcas washing up ashore with bullets in them.