This speech is exactly what it looks like, something created solely for domestic consumption and only by a select minority of the population. If he’d given it on the stump in Bumfuck, Alabama, it would have been met with huge applause by the inbred fucks who compromise his base.
But he gave it before the assembled peoples of the UN, who do not witness such speeches outside of those times they give the mic to tinpot dictators and pampered princes.