And besides, even if it were the case that a TK user can alter time due to tachyons, it’s an indirect way of doing it. Indirect ways of manipulating something are always inferior to the actual way of doing it. Mind you, this is a way to affect time in its “simplest” form, whereas a beefed up time manipulator in his strongest form, is a meta time manipulator, which I just heavily doubt a TK user could both achieve and beat.