That article just seems to be looking for reasons to be mad. Investigations take time. And the repeated mentions of “The T word” are silly. Treason (which the article you linked never actually states, weirdly, when that has to be the word) is explicitly defined in the US Constitution. Other convictions would be just as devastating to Trump and show what he did without having to have a Supreme Court case about whether he was technically levying war.
I do not understand how you could think he’s unwilling to let the department prosecute Trump when Trump already has two federal indictments against him. Yeah, his job is to direct the department. It’s not to interfere in individual cases, whether for or against.