There was no interbreeding.
You can't breed a cat with a lion. They are different species.
You can't breed a chimpanzee with a gorilla. They are different species.
You can't breed a neanderthal and a homo erectus. They are different species.
And, you can't breed the original hominoid with a homo eructus. That would be difficult because the hominoid would be 500,000 years old.
There isn't any proof there.
I see a supposition of species separation, but no proof.
How can one species "evolve" into another species?