It is when the output shows a colder outlook, it isn't when it doesn't. It's like feature A will help if given feature B and feature C, but not if given B & not given C, it might help if not given B and not given C, but if given B and not given C then A definitely won't help, but all these are redundant if not given features D,E & F & so on ad infinitum.
NWP is (literally infinitely) complicated. That's why no opinions are disprovable and that's what makes it fun.