"Indication" and "diagnosis" may not be synonyms, but in the context of HappilyMom's post they convey the same idea. HappilyMom said that the "discrepancy" in the OP's child's results "is an indication of a learning disability". It's pretty clear to me what this means.

As Cricket2 said " "Profile analysis" (i.e. determining diagnoses from an IQ profile or scatter alone) can be inexact and is controversial." Evidently this is something some "professionals" are doing, and it is the viewpoint expressed in HappilyMom's post, and attributed to 3 "professionals" she talked to.

I didn't want the OP to be unnecessarily alarmed by that viewpoint. Fortunately all the other posts provide the appropriate counterview.