Where is your evidence? Are you assuming that the board did not infer a claim to be an Engineer from his discourse on engineering?
Yes this is free speech. The right sense of engineer needed to be understood.
No. I assume the board inferred a claim to be an engineer on the basis of his description of himself as an engineer. I don't know if that was made clear in this article, but that's how it was described in another one posted here on FR last night.