I listened to that last month. He's struggling to regain control of the disclosure narrative and appears to have gone off the deep end in his envy and resentment of the Elizondo/Mellon effort.
BTW, I'm not saying Greer isn't correct in what he says, just that what he says is his opinion (and, so far, only his).
He believes that there are visitors from elsewhere and they are friendly. In fact, he makes money by calling UFO's up for a paying audience.