Fake Third to First Pickoff - Legal or Not?

The situation is first and third with two outs.

The right handed pitcher lifts his leg then steps towards third for a pick off.

He doesn't throwthe ball, but spins and throws to first instead.

He didn't fool anyone since his move wasn't very good, but the third base coach said that's a balk and that rule was changed two years ago.

What's the ruling on this?

Still a legal play in NFHS!

Balk in NCAA and MLB.

Legion of course plays by MLB rules and as such this play would be a balk.

I know, confusing for player's and umpires, but it sparks the age old question of why doesn't the American Legion adopt high school rules. ~Nick Schultheis