Is "teaching" about mechanical things a sign of a guys interest?

A repairman asked my friend if I was single a while back and gave me his personal number but more in a repairman aspect not in a personal aspect (I think?) but hadn't been initiating convos, responds quick and with longer messages though, but not encouraging much additional convo. When he comes to fix things, he often explains the mechanics of the item he's fixing. I've not encountered this with other repair people. This guy explains how it works and how it's supposed to work and why it's not and shows me the parts, even though my company pays for the repairs. Other repairmen generally have kept is short and only the necessary details. Rumer has it he doesn't date people at work, but it's his rule not a work rule. But I can't figure out why he'd care if I was single or not, so trying to analyze other interactions.

Is "teaching" about mechanical things a sign of a guys interest?
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