a "red texas" is a hybrid fish. what you have there very well may have been an attempt to make a "red texas" as it does clearly have texas genes in it. but i do agree with you that it does not look quite the same as most of the fish you see that are being called "red texas"
I have seen so many different hybrids called "red texas" at LFS and online that dont resemble what Id consider a red texas at all. The best looking ones Ive ever seen are on aquabid...for like $500.
Try the hybrid section here on MFK for more about the color & food questions.