Well, no.
That’s because a press spokesman is not in fact in any way like a lawyer.
They are a mouthpiece, no more. They are not required to have any ethics or any requirement to believe that what they say is true.
Trump says his crowd is the biggest there’s ever been and wants to tell the press that; the spokesman’s job is to go and say that.
A good press spokesman manages to do it in a way that almost makes you believe it.
Spicer was so entertainingly bad at it that if it wasn’t for the incompetence of everyone else Trump chose for any position, you could think he was doing it deliberately.
Happily for him and Trump, it turns out that it doesn’t matter in the US because you can say whatever you like and some portions of the media will say “Yes, of course, you’re so right”.