I’d also put my mortgage on this not being the case. I’ve worked at a few employers in Birmingham City Centre over the last 30 years and at each one Villa fans have massively outnumbered Blues fans.
I know that a fundamental flaw to this argument is that it’s based on Blues fans who are employed, but in my experience, having been born in Birmingham and lived here all my life, I see more Villa fans then Blues across all walks of life.