You're talking as if there is some law from time immemorial regarding this, to deal with all corporate boycotts. The 2018 law mentioned was completely driven by the Israel lobby, and all proceeding laws in this respect were due to the Israel lobby. The grand statement "When it comes to businesses, the US government reserves the right to institute international boycotts" is deceptive and farcical- this was instigated due to the Israel lobby and for all practical purposes has only applied to Israel.