Makes me wonder why someone who is an overt heretic and schismatic would be the recipient of a "genuine" vision?
'This alleged vision is attributed to the Orthodx Fr. John of Kronstadt. He rejected the papacy and papal infallibility. Nevertheless I am sure that you will not find anything objectionable here.'
Ok, we are told Fr John was a schismatic and a heretic. We are not told he repented after receiving these visions.
The visions tell us nothing that is new regarding the Catholic faith. I could put together a story like this. I do not believe God delivers such messages to heretics without telling them they too will rot in hell without repentance.
I therefore can only come to the conclusion it was the Devil himself allowing Fr John to THINK he was worthy of such a message from heaven. That way he would carry on being a schismatic and heretic and would himself fall into the Hell the message was telling him about.
This then is a reminder that the Devil is 'the Father of Lies' and can fool anybody.