Personally, I don't know if this particular case really indicates anything *BUT* if one can gather enough circumstantial evidence, one can build a pretty good/reasonable case for the argument. Well, at least that's how it usually works w/ debates and such where one cannot really rigorously prove something either way, including in a court of law.
Still, have there been other releases where the HD-DVD came first, but the BD used a different encode (or have been announced to use a different one, if not yet released)? I honestly do not know. If not, I'd think this case does probably mean at least a little bit more than you believe. But yeah, it's still circumstantial of course.
And anyway, IMHO, if one really cares about the overall concern of the matter, don't completely dismiss such potential indicators as not being "evidence"...