IIRC, he has produced a number of these reactors, and a they have been in use in a number of settings. The people who have used them are sold on them.
Apparently Harvard hot fusion researchers debunked his process. Recently it was revealed they had faked data to show it produced very little or no heat.
Maybe it doesn’t work. I remember my geologist brother and one of his professors in the mid 80’s claiming the idea of “hot spots” was absolutely the most stupid thing they had ever heard of.