That's been the exact style of his 'speeches' since he started giving them, though. I doubt he's any more incoherent now than he was then. He does go through episodes of evident unwellness and then recovers somewhat, but it's long been like this.
That way he's talking doesn't seem unusual for him - remember when he made up a new number on live TV? It was like "one-hundred-million-thousand" or something
"We have made many ventilators, 5000 a day, many thousands, very expensive, so many for other countries because it's very hard, so many."
"We went down then we went up and we went faster than ever before, ever, in any country, the stock market is up 400 points today"