Yes, something like that.
I have attached two pictures. One shows your MZ plugin and the other is the old build of my game. The game was made with the MV.
In both cases I use the coordinates of the hero.
I execute an event with a parallel process and this creates a kind of "loop". While the event specific things are executed over and over again and so the camera follows the hero, the screen query is executed only once, while the event remains the same.
What I also noticed is that when the camera follows the event, the whole thing falters a bit.
Here are two gif's for comparison. The event is the same in both variants, only the plugins are different. In the MZ yours and in the MV another.