It's #fakenews. Of course.
"(i)
“United States person” means a citizen of the United States, an alien lawfully admitted for permanent residence (as defined in
section 1101(a)(20) of title 8), an unincorporated association a substantial number of members of which are citizens of the United States or aliens lawfully admitted for permanent residence, or a corporation which is incorporated in the United States, but does not include a corporation or an association which is a foreign power, as defined in subsection (a)(1), (2), or (3)."
https://www.law.cornell.edu/uscode/text/50/1801
It's some bullshit based on the fact that of course, a FISA warrant can't ONLY apply to one single person, but to a person/organization/whatever connected to a suspected foreign power or influence. But that's not what happened, getting a warrant for a person suspected to collaborate with the Russian gouvernment is like a blueprint for when this law applies.