Scraping and shearing with a hook tool.
www.woodreview.com.au
I could have sworn she used a right angle bent tool with a flat edge on the outside. Definitely all hook tool on the inside.
Me too. I’d settle for a few days though or a week. From my perspective many of those tools make more sense than some western ones. They aren’t difficult to make either. I spent two and a half days on a Blacksmiths course many years ago and I’m confident I could make some. I might give it a try but it’s not easy getting seasoned end grain wood over here, 99% of it gets turned into boards no thicker than 4”.
It does not look like they are using preseasoned wood at the beginning of the video they are cutting discs off of a log then making the turning rounds, mounting them, roughing the inside and outside and putting them aside to dry. Notice the view of a distorted bowl with a true circle around it, which apparently is their method of showing the effects of drying. Yard trees or city trees usually are crooked and not suitable for sawing into lumber, but you don't need long straight logs for end grain bowls.
At the symposium in Tacoma Washington, which I drove my pickup truck to, and along with our MWA chandelier project I brought Allan Lacers adaptation of a western lathe to Japanese style. Allan did a rotation on it but I can't say how it went because I didn't get a chance the see it.