Not that this would apply in your case (I don't know you), but in general there are plenty of well-credentialed people that are poor engineers (imo), or who are

Not that this would apply in your case (I don't know you), but in general there are plenty of well-credentialed people that are poor engineers (imo), or who are a good engineer but a poor fit for that company/team/position. And there are people that simply lie on their resume. If it is standard at the company to give all candidates that same question, this is actually a good way to reduce bias in hiring decisions. Otherwise, you might bias toward hiring, say, people with college degrees or people who worked at large corporations, for example. And this might unintentionally bias against certain demographics that obtain college degrees at lower rates (for example).