Those certainly sound like gifted scores to me as well with a lot of unevenness which is not uncommon in young gifted children. Did the school tell you anything other than the scores? Can you request a meeting with the GATE coordinator for the school or district to see what they can offer?
We, too, have some definitions of gifted falling into leadership ability and things that I see as personality attributes like a pp (prior poster). (DS, by the way, means "dear son.") Our school will also id a child as gifted based upon ability as well, though. However, that ability must be coupled with high achievement, so a child with scores like your ds's would also need to be achieving at a place similar to his ability or he wouldn't qualify for a gifted identification or differentiation.
As you can probably see, how a child is identified as gifted varies a lot from place to place.
Let us know what help you need and we'll see if the collective experience here can be of any assistance.
