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I don't think he was suggesting you gave an actual recognised diagnosis whilst flying past her. But you did say it makes her sounds like she's "quite far along the autistic spectrum" which is problematic in and of itself and then go on to say you think she's useless after doubling down on the report making her sound autistic stuff, so inferring "on the spectrum" relates to useless.
I'm not sure that bandying around ASD as a flyby diagnosis is helpful to anyone, least of all to people that are neurodiverse.