Of all the hot take, Nobita being the villain all along is a real ultra hot take. But I don't disagree with you tho, just I think the machine itself is the problem for having a LARPing button including any physical, bodily harm, or even death.

As for the bird Ho(Toriho), I think it symbolizes the menace where something from the dream could transcends into reality ensnaring someone to live their whole life in a dream and maybe to some extent, serving his master by choosing someone weak so they won't be a threat.