They don't owe anyone on HN or anywhere else any kind of "ownership of statements" or explanation. The published some source code. They got sick of it. They've moved on. It's over.
I understand the urge people have to synthesize a soap opera narrative out of things on message boards --- that's fun, after all, and the alternative is boring. But that's all the conversation about the TC project abandonment really is: a synthesized soap opera.