Plenty wrong in what he said.
It's not only the idiots on twitter saying Maguire shouldn't be starting games. It's also the current United manager who gave him his chance and then decided nope, he's better off on the bench even though he is captain and will likely b*tch about it to his friends in the media (exactly what is happening). He dropped him starting the Liverpool game too, which is a big call to make.
Also, when does becoming captain of the most unsuccessful United side in recent decades, without a trophy in 5 years, become a great achievement? If anything, it's shameful. The likes of Williams have no idea what winning at United means, just like his captain.