Not necessarily. Doctors are exposed to a different set of risks while on the job than ordinary people going about their business. And common sense already tells you that it's a good idea to take precautions when working with sick people, so the fact that doctors wear masks while ordinary people going about their business don't have to should not come as a surprise.
That's not to say that doctors (and others) can't have reasons other than "masks don't work" for recommending that people (other than other doctors) don't wear masks. Just that doctors wearing masks themselves, by itself, is not enough to know that their recommendation for ordinary people not to wear masks is unreliable. You need more information.
In this case: doctors wearing masks conflicts with doctors recommend people don’t wear masks.