Accusing tone? Frankly I don't even understand your reaction.
I simply pointed out that your NT brother may- or may not have chosen to comprehensively explain why your niece did not appreciate the gift. That perhaps he was just being tactful, and perhaps unaware that you may attempt to buy a similar gift. That's not a crime, Rich.
Considering the age requirement of the first gift, your seven year-old niece
may simply have not liked the gift in its entirety rather than a claim that it was too difficult.
I'm simply cautioning you against the possibility of making a mistake twice in a row.
That it's best to candidly ask your brother if she simply didn't like the gift. If this is in fact the case, you need to look for something else and not just a variation of the same gift. On the other hand if your brother's response was quite to the point, then it might be a better choice anyways to purchase something else.
If you have a brother- and a niece as well that didn't want to hurt your feelings, it would seem to me that this is a good thing. After all, we can't all "hit one out of the park" when it comes to buying gifts for our loved ones. There's nothing offensive about it. It's just a social dynamic that happens from time to time, especially over rituals of exchanging gifts.