Actually I agree that this bug belongs to packages.d.o, the main reason
being that the PTS is _source_ based while NEWS file are specific to
_binary_ packages. (The fact that dh_installchangelogs might install a
NEWS file in all binary packages matching a single source package is an
unimportant detail IMHO.)
So, while I see the reason of existence of #419201, I do not see the
reason why #418689 still exists. Even when #419201 will be fixed, the
PTS will not need to show anything more than the already existing links
to packages.d.o. Hence, closing this bug report.
Cheers.