This part is actually not true.
What I discovered was that by hosting this as a campaign event, Mr. Trump could determine who was and was not allowed in the venue. If he came on an official visit, they could not prohibit anyone from entering and he couldn't sell his campaign merchandise.
Whether he bills it as an official event or a campaign event or hell, a birthday party, outside of diplomatic issues, it is the Secret Service who have the final say who can't come in. Even with an official visit, there are ways to work that system so only those who he wants are in. Selling merchandise is not even a point here.
The rest regarding theatrics, group dynamic, etc, are pretty much standard operating procedure. This is the kind of stuff you see with many churches and motivational speakers to get the crowd completely with you and in sync.
Now, saying that is normal doesn't mean I believe that is good. These are things to watch out for to understand if you are being manipulated. These were YUGE! red flags with Obama and we called them out when we saw them. With this administration, they are painted gold and on full display. It is worse seeing what should be your own side falling into these group manipulation/NLP type traps.