I have done seminars with Kumar and studied with someone who spent 10 years training with him.
He is not based in Boston, but in California.
He was one of the first Americans to go to mainland China (after Japan, Taiwan, and also to India) to study internal arts, including chinese medicine and also was a taoist priest. Putting all else aside, he should be respected and acknowledged as helping to open the channels along with other Americans who took the time to travel to China and helped open the lines of communication.
His IMA skills are real, his knowledge is deep. I'm not crazy about his personality, but I respect his accomplishments and knowledge.
His is admittedly a controversial figure.
Push hands claims aside either fictional or real (thats the problem with second hand information) I would want to fight him.
FWIW
The more one sweats in times of peace, the less one bleeds in times of war.