Wasn't the ball used in the Dutch league as well? I know Ajax did at least.
Some Belgian clubs even played with it.
Obviously Italy, Spain & England couldn't use it due to commercial / sponsor agreements. Simple as that.
But the fact remains: these are nothing more than excuses. Every team has been training with that ball for a few weeks now. Honestly, how long does it take to get used to a different ball when you're a professional player?