Sounds like ds1 is making great progress.
DO NOT CANCEL THE APPOINTMENT
dd1 (ASD) is always doing a similar thing to me - we took her down to BIBIC last month for assessment. Comes to the gross motor skills side, and we were running through general development - "can she jump?"
oh no, I said, she likes getting onto a trampette, and bouncing, and she calls that jumping, but she has never jumped. dd1 walks over to the trampoline, climbed on and started jumping.
we had a meeting here at home yesterday to monitor progress at pre-school. her TA was here, and early years senco. we were discussing how to get her to colour match. we currently use toy dinosaurs in blue and yellow, and 2 bowls (blue and yellow) to get dd1 to sort the dinosaurs. She has never done this taks successfully. tried to get her to demonstrate her failure to area senco, and she completed the task.
Sometimes I just think she's taking the p*ss
Seriously, I have about a hundred other similar tales - I always say that if I could organise an official review/progress check every fortnight or so, dd1's issues would be a lot less. She seems to take great delight in wrongfooting me, but as long as it means progress then I'm all for lookig a fool!