What's next, Mega Man being recognized as a Hanna-Barbera cartoon?
https://en.wikipedia.org/wiki/Ruby-Spears#History
The Ruby-Spears studio was founded in 1977 as a subsidiary of Filmways and was sold in late 1981 to Taft Broadcasting, becoming a sister company to Hanna-Barbera Productions. In 1991, Ruby-Spears was spun off into RS Holdings while most of the original Ruby-Spears library (its pre-1991 library) was sold along with Hanna-Barbera to Turner Broadcasting System, which in turn merged with Time Warner (now WarnerMedia) in 1996. The Ruby-Spears studio closed in 1996 after 19 years of operation.[2]