I think that is somewhat misleading.
The article says that membership was stuck at 80,000 for more than a decade.
The 2019 numbers of 187,000 total members and 100,000 fan members. So that is 87,000 “non-fan” members, which as a growth rate of just under 10% for “non-fan” members. This is good, but not as big as they make it sound.
I do not know about USHJA and USDF,but USEA membership has been essentially flat.