Likely, and the special relationship the countries once shared before Xiden betrayed the UK, and was held in contempt of the united kingdom
They know what Trump's deal was with the Taliban in February of 2020.
He may have been clueless. Keeping her waiting and walking in front of her etc may be rude.
Not bowing was normal. Americans especially presidents do not bow to royalty.
The english know this and understand it.
When the sovereign is much older it would be a gracious courtesy to bow.. and it costs nothing.