I can’t really evaluate or trust that part - it’s a redacted quote from some unspecified doc from an unspecified source. My point is that building factories generally requires a different visa because ESTA and also B1 have many restrictions. The fact that it says B1/B2 in there undermines its credibility - one is a travel visa not a work one, and it doesn’t make sense to mention them interchangeably.
"In practice, the two visa categories are usually combined and issued as a "B-1/B-2 visa" valid for a temporary visit for either business or pleasure, or a combination of the two."
Its right there in the link the parent gave. As in they had a visa and ice acknowledged no violation of the terms of that visa in very plain english.