"Goat" is not a taboo among Hmong people worldwide whatsoever to my knowledge. We, meaning Hmong, consume "goat" like any other livestock; cattle, pigs, chicken, turkey, duck, lamb, monkeys, and other wild/domestic animals, including -- yes even "dogs and cats", though that I've only heard stories about -- mainly from the elders when they were in SE Asia.
That said, "goat" is not a prime stable on the Hmong diet, like cattle, pigs, and chicken. My guess is mainly because of its "goat aroma/smell/stench" which is not very palatable to most Hmong; unlike the other livestock which have not after taste, or smell/stench.
As for it being "powerful", that's just a belief, or Hmong superstition. Goat, for some Hmong, is considered a delicacy. (Not gonna elaborate on that.)
My family, uncles, and relatives (in-laws), all who are Hmong, have "goat" stew at least 2 or 3 times a year. Yup, that does not compare to cattle, pigs, and chicken on a daily, weekly, and monthly basis, but the point is "goat" is definitely not off the Hmong menu -- or a "taboo" period.