I am unable to watch the video here (firewalls) so I cannot see Gavin’s technique which would likely impact my full opinion.
That said, I have spoken with Gav a few times and I know that any info he puts out is well meant. That does not mean he cannot be wrong and on a few occasions he and I have exchanged ideas around mistakes.
I personally do NOT advocate oil of any kind being used as a mite treatment. As Don notes, there is a risk to the animals using oil. I could caveat this six ways from Sunday but until I see/hear what Gav has to say I am not going to throw in on his video.