Don't agree with this.
it doesn't matter if you agree or not. we're talking about terminology here and there is a right and wrong answer. you can spin frontside, you can spin backside.
if you need to counter-rotate your body so that you can rotate (wind up so you can spin) then that's fine, you're like everyone else on the planet who's bound by physics - but don't go fucking with snowboarding terminology - fuck!