IMO schismatics telegraphing their punch (and lying).
Lying is a strong charge. I would be ambivalent whether the problem here is lying or prelest: the report did not suggest that the visionary warded himself with the sign of the cross, as has often dispelled visions sent by the Father of Lies.
Of course the reunion of ROCOR with Moscow, and thereby full communion with the rest of the Church displeases the Evil One. It would not be surprising if a false vision were visited on one of those inclined to schism.