Many have claimed to translate parts of it. What makes you find this one particularly convincing?

Thanks for sharing. I don't have the expertise to evaluate the claims, but it's certainly an interesting theory and a compelling story. Just wish he'd continued the presentation of his work.

Any idea why they removed the videos? Even the reddit thread you link to is deleted...

A lot of people were speculating he would make his findings official and didn’t want to over share. I do see a comment about his theory being debunked. That would be expected, the language used was a mashup of several existing languages, so it’s possible a lot of what was written is copy-pasta gibberish. However, the video points out of a lot of cultural aspects of the book which support a Romani origin.

I watched some of the videos in the link given by nyc_pizzadev, and recall seeing them when they were first released. He's continuing the work of Stephen Bax. Romani is convenient as it allows him to pick and choose words borrowed from various languages into Romani over a wide area, so if Farsi doesn't fit, maybe Bulgarian or Uzbek might, whichever is the most convenient. But until he translates some of the VMS (a few pages in different parts of the manuscript would suffice), and his translation isn't nonsensical, he hasn't solved it.