Jews as a people are no more or less artificial than the Brits, French, Germans, Dutch, Danes, Swedes, Portuguese, Indonesians speaking the invented Bahasa language Italians (remember Cavour, "we've made Italy, now we have to make the Italians").

And Jews as a people are certainly less artificial than the Spaniards (in the eyes of Catalans and Basques), Russians (in the eyes of Tatars, Bashkiris, Kalmyks, Komys, Karelians, Yakuts, occupied Ukrainians, Tuvans+100+ more of Russia's subjugated peoples), Belgians (in the eyes of the Flemish and Walloons to each other).

The definition of anti-semitism is holding Jews to a higher standard--of unity, continuity and uniformity in this case--or not applying the same standards of behavior, unity, historical continuity to other peoples as are applied to Jews. By this definition the author qualifies as anti-semitic by applying a standard to Jews he'd never apply to some of the peoples above who clearly surpass Jews in the cosplaying disunity and discontinuity departments.