Not correct Dave.
About ten years ago, discussing the Troubles in Ireland, a Guest was aggressively attacking me with things that were not true, and refused repeated demands to retract or substantiate.

To make the point, I logged on in his Guest name and in a single post had him make a grovelling apology and admit lying.
He would never have done that so everyone knew at once it was me, and of course he came on very quickly furious that his name was taken in vain.

It was not an attempt to deceive the forum or to boost my credibility.
It was not dishonesty.
It was a harmless joke at the expense of someone who richly deserved it.