Given it was never marketed, it's possible perhaps despite the feature being exposed it never worked correctly and AMD saw fit to just disable it rather than people get a false sense of security through it.
"no one uses it and there is a bug" may invite more questions or panic, but "that's all we're going to say" implies that Mythos found something scary, or that the NSA demanded they all get turned off.
What is it about today's tech scene that makes you think it's FUD? Do you see strengthening regulations that prevent monopolistic and anti consumer practices? Do you see more competitors and companies being split, or are have there been more consolidations and stripping and politicizing of personal rights and freedoms?