I believe that all prophecy concerning the return of Christ, the seven year Tribulation, and His millennial kingdom are all complete in the Scriptures, with nothing to be added to those prophecies, but I'm not going to be the one who makes any emphatic statement that God has never, ever used anyone else, especially a Rabbi, to prophecy something like this that latter day Christians could then use as confirmation that Christ's return is near and see fulfilled Christ's promise that we would know when His return is "at the door".
It's fine to use other sources for "information" to give us understanding -- some better than others. And, of course some "information" is plain misleading and will get people totally off track (which would be Satan's plan, of course...).
But..., that's just regarding information or explanation or commentary. You can take it or leave it and it's not authoritative.
However, when someone says "this is a prophecy from God" (or a follower says of this -- "this is a prophecy from God"0 then it's being elevated to Scripture status and in that case, for anything that someone who says like that -- it's basically as valid as listening to a Buddhits or a Muslim cleric or a Satanist (even) -- because all of their "prophecies from God" are as much garbage as the next person in this world.
Scripture is where a prophecy from God is to be found...
But, again, I'm not talking about commentaries or someone "giving an understanding" about culture or words or some obscure meaning in Scripture -- I'm talking about someone who is going around and giving out "prophecies from God" out of his own mouth and his own writings.
Now, nobody who is alive today was around when the Rabbi made the prophecy so no one can say with any authority if God inspired him with this prophecy, which actually happened, or not.
I guess at this point we will all have to believe what we want. Like I said before, I will not take it upon myself to state that God had nothing to do with this prophecy, which actually happened, because I wasn't around.
And neither were you.