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Many applications and libraries say "Python X.Y or newer", and it is one of the strengths of Python that this will often be true. That's what our backward compatibility policy is about, and that's why the fact that it isn't true for 2.x->3.x is such a big deal. As far as I can see there was no deprecation involved here, so "announced" is not a factor, I think. We won't be sure until we know what changed.
All that said, it is quite possible (even likely, given #11898) that the pyamf code contains a bug and only worked by accident, and is now failing because some other bug in Python was fixed. Again, we won't know until we have a complete diagnosis of the cause of the change in behavior.