Waldorf has a non-academic kindergarten and doesn't even introduce letters and numbers until the first grade.
Um...you do know he can read, right? His reading scores are actually quite high. He was reading some pretty impressive words there at that GE4.8 level. And even though they didn't score his fluency, his GE there suggests he's fairly fluent.
The two subtests under "knowledge" do measure what is referred to as "crystalized intelligence" (what a kid knows), and his score there is very high as well, easily in the gifted range despite the lower "full scale". Despite the lower spatial scores, and in light of possible indentified problems there, this is a very gifted child.
It is interesting too that on that one low index (simultaneous), only the one test (pattern reasoning) is extremely low (5). The other two are easily average.
I'm not sure how to advise you further. Does he enjoy reading? The Waldorf school and philosophy might not be the best thing for his ability level.
It's too bad he was too young for math scores. You might consider retesting him once he is 6 (or later).
I lost sight of your original question. Is it for placement next year? Who did the MVPT? Were their followup recommendations from that? He does have a good sized gap from his crystalized scores to his visual-spatial type ones, and that
could be meaningful.