All the photos posted so far have had their vibrance turned up and their levels adjusted. MINIMAL adjustment to one of the pics provided by @KsKingBee can do the same thing to his charcoal birds in pics. Add in leucistic genes and you can get pretty sharp colors.
If they aren't being advertised as "black" though, and especially since they are specifically being sold as charcoal, it's disingenuous to call them something new. You're also using poor-quality images of charcoals in yellow light. Here's a charcoal from rocking BAB ranch in similar lighting...