Yes, this is it.
"Nerds" are just another collection of market demographics. They (whoever they may be) are driven by a complex mix of desires and emotions just like everyone else. I don't think advertisers even bother to have a bin that one would label as "nerd". We are FAR beyond such coarse distinctions in the era of surveillance capitalism. Isn't that the point these days? To market at such a fine granularity that it becomes individuals?
Sure, turn on your adblockers, fire up your pi-holes and make intricate ublock-origin filters. You're still being marketed to, and if you're buying stuff, it is working.