Yes, he did. When a doctor hangs a sign outside his office and invites the public to partake of his services, he is inviting people on to his property. If he wants to invite the public on to his property, he shouldn't be permitted to require them to wear masks. If he doesn't want maskless people on his property, he can close his business.
You think that "masking is a crime". But I don't. People wear masks for whatever adaequate or less adaequate reasons, and neither I, nor you, nor the state has any right or duty to interfere in private businesses. LastTradhican wears a mask when using a leaf blower. Should he be persecuted for doing that, just because some think that that might prejudicate his health?
A doctor invites people who follow some well known, and more rarely some less well known rules. Everybody knows this.