Aren't you spreading misinformation by saying there's nothing to suggest they are hybrids when there are full articles on Google explaining that they, in fact, are hybrids?
Do you mean the articles you have not linked to?
Here's the issues: true hybrids are extraordinarily difficult to achieve in nature simply because that's how species operate. Selective breeding for color within a species (initiated by humans) however is many factors easier because it's not crossing species.
That's based on science ---- not what someone heard someone else claim.
Interestingly enough, your argument seems to be that hybrids is a more plausible explanation (over selective breeding) because people on the interweb repeat the same theories over and over. That's wholly incorrect.
Whenever you have 2 competing claims, one highly plausible and one highly implausible, it's misinformation to argue the implausible one is correct simply because people have said so.
If people want to claim it's a hybrid, they can pull the DNA and prove it. Until someone does that, it's unsupportable to keep claiming it.