How is it possible to say anything one way or the other about this? John XXIII could have been wrong or right. The Church says he was wrong. Unless we had access to all the proceedings, how are we going to be able to discuss who is right?
As to the attributed miracles? Why not? What kind of limits shall we put on saints? Our Lord said,"And greater things than there shall you do."
If you think Catholics are at best deluded in the major principles of their theology, you will probably think that we're deluded in thinking Padre Pio a saint. If you don't, you probably won't.
But having tasted the article a little, I'd say it has a flavor reminiscent of the Apple of Discord. It looks to me like something tossed up just so that there can be a disagreement and maybe some opportunities take little digs at one another.
As I said, cute.
And if Pope John XXIII was right about this, what else to Protestants believe he was right about.