He explains that the Chalom in these circumstances mean a state of blurriness, in which anything goes, so that the Navi shouldn’t be shocked when he hears a Malach speak.
Hate to say it, but this sounds more like LSD than Nevuah.
Yichis, but there are sources that seem to admit partial determinism. The bracha Hameichin Mitzzadei Gover is based on Mishlei 20;24 and the pasuk is more blunt than the bracha. One idea is that we are led to believe and we do believe that we are free agents, but we are in fact just plain agents.
Predeterminism is different than “partial determinism”. After all, Hashem does decide before you are born whether your Neshama will be a Kohen or not. Genes are another example.