To be honest it sounds to me as though you're being wound up by this school director who is saying a few things that don't make sense to me.
Most glaringly, it's nonsense that your DS (necessarily) needs to be taught to read differently because he's highly visual spatial. There was a vogue for analysing children's "learning styles" and claiming that these had straightforward consequences for how they should be taught a few years back, but it's since been debunked, and it was never as simple as the school director suggests anyway. A good teacher will have various tools; he's likely to be more interested in some than others and to get there with some combination of what works for him, but you can't predict what that combination will be from an IQ test (science can't, I mean, and the school director shouldn't make such pronouncements - you and the teacher should feel free to guess what will work best and try that first, but don't be too surprised if the way he learns is different from your guess!).
Secondly, you don't need an explanation for the difference between two subtests in the same index. If they were always close, the test wouldn't need both! If you have other reasons to suspect vision issues - even if you're only spotting them now you think about it - by all means do go to a developmental optometrist and get him checked out. But to suggest someone do so solely on the basis of a discrepancy in an IQ test seems bizarre to me. Maybe he just didn't like that subtest!
Do you like this director's judgement otherwise? Are you sure the school is a good one? The things above are red flags for me, but if everything else was good about the school I'd smile and nod. (Your DS did get into the school, right? You didn't actually say.)
Going on: don't confuse "is he gifted?" and "does he qualify for DYS?". The results you have look pretty squarely gifted, but most gifted children don't qualify for DYS, and their support is not a magic bullet. Some here have found it helpful to have a DYS person talk to a school, more have found DYS a useful way to find peers for social events, but not getting your son into DYS isn't a disaster. And not doing so is reasonably well correlated with not needing the particular support they offer anyway. You don't yet know, at least as far as what you've said goes, whether your DS is going to have trouble at school. He may indeed be in the range 130-140 which (if I remember rightly) is what's sometimes called "optimally gifted" because these children tend to fit in and do well with mainstream education, have little difficulty interacting with most of their age peers, etc., and yet do well. If so, be happy! DYS is trying to help the children for whom those things are not true.
As to the score themselves I'm no expert and as someone else said this is a new test - but I don't think the scores you posted really qualify as "all over the place"; there's some scatter, but you always get that, and he clearly has lower processing speed than the other indices, but that's normal. Did the psychologist express concerns about scatter, or just talk/write through it?
If you choose to retest when he's 6, the WISC-V would be the obvious test to take (the WISC-IV has been replaced). But I'd suggest not deciding that now. Wait and see whether you think then that testing might give you useful information.
