People seem to be taking this as some sort of attack on mourinho as a whole rather than what it was
Murray had been talking about Rashford's run up to the world cup and started the idea of lack of playing time
I'd agree that what De Boer said in this instance is on the rather misinformed side, though he goes on to give fair points regarding the arrival of Sanchez
Very thin skin on Mourinho's part to respond like this though. Also equally misrepresenting the statistical truth, which is that De Boer only managed 4 PL games, not 7.
Also think this tendency to completely write off someone like De Boer's accomplishments and standing out of blind partisanship, as in this thread, is laughable.
What I will say is that De Boer is a very poor manager though, delusional about the way his own teams play(ed), and the things he says regarding football, and Ajax in particular, as a pundit never fail to baffle me.
On the other hand he's a very sympathetic man who lacks some subtlety in the way he says things, particularly in English, and to fight his corner a little he does have a solid track-record of top-class Premier League players developing under his management, such as Vertonghen, Alderweireld, Eriksen, and, though less impressive than the others, Blind.