Yes...and Adams was accused of being a monarchist.
Given what he wrote in the Federalist Papers, it is seems likely to me that he had a change of heart.
If he didn’t have a change of heart, he was one heck of an intellect to take the stand he did so persuasively if he didn’t support it, because that is a tough thing to do.
All nations, under all governments, must have parties; the great secret is to controul them: there are but two ways, either by a monarchy and standing army, or by a balance in the constitution. Where the people have a voice, and there is no balance, there will be everlasting fluctuations, revolutions, and horrors, until a standing army, with a general at its head, commands the peace, or the necessity of an equilibrium is made appear to all, and is adopted by all.