You can agree with someone whilst still thinking they are wrong for saying it out loud in the media. If Ragnick came out and said "Harry Maguire fecking sucks", he would be right in saying that, but he would also be wrong for saying it. Mourinho was right about a lot of things too, but the abdication of responsibility when things aren't going the way you want them to, and talking down your players and separating yourself from the mess at hand to prop oneself up is classic Mourinho behaviour (I say this as a once Mourinho fan).
Everyone knows Spurs are cheap and have a weak squad, and sure, it can be cathartic to hear that your shiny new world-class manager feels the exact same way about your board and players as you do, but who exactly do these truths help? You can convince yourself he's doing it to put pressure on Levy and the owners, but he's doing what he's always done - protecting his own reputation. The thing is, he doesn't even need to do this because everyone with the slightest bit of sense knows this Spurs squad is a mess and it's not on Conte, but his ego can't handle it.
So, once again, we have the story of Conte told by Conte - the perfectionist, the winner, the martyr - fighting against the tide of mediocrity with no one to help him. What a hero.