No, there isn't a contradiction. A good pitcher can pitch well despite a bad catcher, but he'd pitch better with a good one. A poor pitcher will suck with any catcher, but a good one will allow him to hide his flaws better. And there's a lot of pitchers in the middle for whom a good catcher can be the difference between effectiveness and ineffectiveness.
A catcher can have a net positive and net negative effect on a pitching staff. All I'm saying is, I want to see which one Martinez is with this staff before I hand him the reins for next year and beyond.