Partly true, his swing is actually very comparable to Jose Bautista. His load is done well to generate power. He has a Nike check swing that all good hitters have. He has a little wide of a base for being only 6'0 but it doesnt affect him. Now, he could have some problem with breaking balls because when he commits, he commits. He does not rotate the knee. He just bends it which will be harder to hit breaking balls. The other problem is his front foot landing. You saw how he went down on a knee in one of his bats. He does this quite frequently. He doesnt point his foot forward. He keeps it closed which looks like he rolls his ankle. It could lead to an injury one day.
But, I would like to hear what he says because you have to know Baez swing. Dabynsky is correct that his bat speed makes up for some funkiness, but his load, swing path, and rotation are pretty awesome. Remember, Baez is only 6'0 and 195 pounds and has outrageous power. He has to generate it someway. He doesnt have the leverage a Kris Bryant does or the brute strength a Stanton has.
He has hit many homeruns like that in the minors. I will take a 414 foot opposite field homer on a supposed bad swing.