(If anything, then this certificate might raise some eyebrows. Usually, people learn how to teach online by taking workshops on the campus where they're teaching and by just doing it.)
Chime. These workshops on all sorts of things are often unimpressive and perceived, at least in my world, as shortcuts to avoid doing more serious training or scholarly work. This program sounds like a profit center for its sponsor, which is fine--but I don't see how that would improve one's chances to teach at a college or university. At my school, our distance ed people recruit the best classroom teachers to be excellent on-line teachers. I've seen their stuff demo'd, and it's amazing. But they started as solid teachers, with those troublesome PhDs.
OP, "pressure to publish" may not appeal to you, but in most colleges, you'll feel some pressure to publish--far more so in a big PhD-granting research school than at a community college. It comes with the territory.