There has been rumors, going back to Aug 2004, IIRC, about Apple testing a TV.
Obviously, it still hasn’t happened, but the rumors come back every now and then.
The original rumor was about a 40” and 50” plasma, and the details have changed over the years, but basically the same, Apple testing a TV.
My guess is that the rumors were probably partially true, but maybe confusing the TV for Front Row, and the what we know as the 1st Gen Apple TV.
Maybe the rumors that popped up over the years was really about other Apple TV generations, or maybe false info to catch leakers.
Another note about TVs, the margins for them are super thin, so if Apple wanted to put their own TV on the market, it most likely would be price way higher than a comparable non-Apple brand if they kept their usual profit margins. They probably wouldn’t sell much.
Besides, the best thing that Apple could do to entice potential buyers would be a SW solution, which is already available in the form of an Apple TV and tvOS.