You are right. Perry Stone has been around a long time and has made hundreds of predictions based on scripture. None have ever come about.
I try not to cast dispersions on others trying to present God’s word. I will say I agree with you though, as far as prophecy goes God is very clear
Deuteronomy 18:22 when a prophet speaks in the name of the Lord, if the thing does not happen or come to pass, that is the thing which the Lord has not spoken; the prophet has spoken it presumptuously; you shall not be afraid of him.
Anyone claiming prophecy who has been wrong even once is to be dismissed as far as any prophecy they present. I say this because God clearly says in the verse be not afraid of the prophet, God did not say be not afraid of that specific word the prophet spoke.