This seems like a useless statement. Surely no one is consciously failing people they know fit the team and can perform the job. The whole point of interviews is noisily assessing these things. Point me at a reliable, cost-efficient way of determining that and I'll gladly champion it.
Perhaps their point is that HR and recruitment agencies do just filter candidates by "10 years redis experience" and most good candidates never get noticed.
I don't have C# on my resume. I wouldn't shrink from working on a C# codebase though. Would I get an interview though? Unlikely.
