From VAS Aviation, https://www.youtube.com/watch?v=Pbm-QJAAzNY, or possibly in the comments, it was noted that there were 2 people on - one in the tower, one elsewhere in charge of approach. So perhaps, it's innacurate because he was working "with" the person on approach, but still accurate to what we would all call "working alone"?

If a member of this administration said he wasn’t working alone, that’s solid evidence he was.

The evidence that he was overworked seems pretty damned obvious. He forgot about an entire airplane and put a fire truck in its path. The evidence of overwork is strewn all around LGA.