This is a definition of ulterior motive.

I'm not making a judgement whether he was right/wrong by giving that advice (which the WHO did as well for the same reasons). Just pointing out that he did lie.

I personally don't like being lied to by people that represent a lot of power (doesn't matter what they're motives are. Lying is used to deceive for ulterior motives). That is just an indicator that I can't trust public facing scientists because the truth is not a priority, rather only the outcome that they desire (whether personally or as a group.) But that's not new.