It would seem rude for a toy maker to be asking children for their gender as assigned at birth (which is what I assume you mean) so they probably don't know.
You don't have to ask about their genitals but given you claim boys like jewelbots (which they very well might do) I think it's pretty relevent to understand whether those are biological boys or simply biological girls identifying as boys.
One would be less interesting than the other. Here is why.
Did they say they asked? I thought that comment just indicated that they had noticed. And since you are the person who brought up the concept of identifying as a boy in this context, I don't think anyone else can tell you why it might have seemed relevant.
I am not sure exactly what gender identity rule I have broken for asking my original question but I find it pretty interesting whether those who identify as a girl also are girls biologically but identify as boys or whether they are biologically born boys.
The reasons I asked was because it was claimed that many of those who use it identify as boys.
Maybe I am alone in thinking this is an important distinction but none the less I find it pretty relevant to what to make out of it in the grander scheme of this discussion.