https://news.ycombinator.com/item?id=39551457 was the HN article where I picked it up. Buried in the middle of the video is a minute or so talking about earlier successes with ultrasound, the essential tremor treatment. HN commenters indicate successful treatments.
You mention that only one limb could be targeted. Did they explain that this applied to one limb at a time or that it applied to only one limb period? The other reply states both, but maybe that's because of differences in procedure or clinic.
It is covered by some insurance and there are also clinical trials that you could get in which would provide it for free.
Gut - and oral - dysbiosis have been linked to other neurodegenerative diseases as well, so I'd really encourage you to look into this avenue.
Have you looked at implants or other treatments for essential tremor?