I agree, it seems odd to decline an obviously experienced and well-regarded sitter for some arbitrary criteria, especially when the other available options are few. I think some HOs have an idea of what they want in mind, and stick by that rigid criteria, despite being presented with attractive alternatives, as the OP has demonstrated here.
To be declined because they deem the other sitter favourable, without giving you the opportunity, shows they have made assumptions about you based purely on your location (as others might do based on age, whether you are solo etc.) I hope you find something else, and a home owner that appreciates you!