Technically, a "statutory" citizen is a "naturalized" citizen since Congress (who created the statute) only has the power of naturalization via the Constitution.
7 FAM 1131.1-1 Federal Statutes (a pdf)(CT:CON-349; 12-13-2010) a. Acquisition of U.S. citizenship by birth abroad to a U.S. citizen parent is governed by Federal statutes. Only insofar as Congress has provided in such statutes, does the United States follow the traditionally Roman law principle of ―jus sanguinis‖ under which citizenship is acquired by descent (see 7 FAM 1111 a(2)).
Of course, those statute(s) (naturalization laws) can change with any Congress in session.
I agree! Thus my parenthetical “(Of course one could argue ...).”