Most of the people eating goat in America are not white and don't get it at the grocery store, so I have no confidence in the USDA numbers on that. I work in the forage and grazing sector so my opinion is not just as a goat consumer but also a SME for grazing livestock production.
The USDA numbers are based on domestic slaughtering (600,000 head annually) and imported goat meat (~41 million pounds annually). I'm skeptical that there's hundreds of thousands of meat goats that the USDA can't track, which is what would be needed to shift those numbers.
Goat & lamb are not popular among US whites, but that demographic is not growing as fast as POC with culinary traditions of goat and mutton appreciation. A huge soapbox of mine is that the sheep industry (not as much the goats, as there is no "industry" per se) keeps trying to target white consumers
So many ppl ate goat & lamb/sheep before they/their families immigrated to the US. I sometimes wonder if more ppl would eat it now if it were readily available & not considered lux (lamb for example).