Man did this thread go downhill. I didn't think it could get worse but I was wrong.
Anyhow, like I said before Karate peeps don't use jow when conditioning. Probably gets the makiwara all soaked and mushy.
I don't know why other than hearing that they were copying what they saw and never learned about the jow. Also heard the Chinese intentionally withheld that knowledge when teaching any Japanese.
AFAIK this is common knowledge in the Karate world, I thought the MA world in general but I guess it never reached the SD crowd. Before I got into Chinese arts I played some TKD, Shotokan and Kenpo Karate and never knew about the jow.
I also did some conditioning without it breaking boards (thin ones, nothing impressive) with my fingertips and patio blocks with my wrist. Didn't do it for a long time though so I can't speak to any long term damage.
Mike Reeves holds the record for the most consecutive boards broken and I don't think he uses any jow. I don't know for sure though but I'll try to remember to ask him next time I see him.
Here he talks about conditioning with no mention of any liniment.
So yes, Goju is correct when it comes to Karate conditioning exercises although I don't claim to be any kind of expert on it. I suspect if any of them do use jow it's a fairly recent addition.
His other claims about diet and such are all his and I know nothing about any of that stuff. You can agree or disagree all you want about benefits of jow for conditioning but the bottom line is he's just passing along info as he knows it so I don't see why he's getting crap for that issue.