At 1:05 minutes of this video, the cichlids look like SRTs called crystal marbles (if I understood the second word correctly). I am confused by the vieja's body shape and low aggressiveness, which is not typical for SRT.
I agree with you that these hybrids are red texas mixed with some other fish. More and more of them have been appearing lately. Nobody wants to systematize them. For example, my RT F1 (female and male) from the cross Herichthys carpintis x red parrot. And female RT from Thailand.