Earlier quoted context omitted.
You don't have to be aware of any of that stuff in order to know the difference between "this can't be published" and "this can't be published in a physics journal". The latter is (perhaps) good judgment; the former, a poor understanding of the limits of one's expertise.
I can't seem to find the claim in the post where the journal editors actually said "this can't be publishable, period". I am pretty sure that when the physics journal editor rejects your paper, she isn't even actually saying "this can't be published in a physics journal", she's really saying "this can't be published in this physics journal" (unless she says otherwise, explicitly, of course).
Why not go with "they aren't even actually saying" rather than the faux-affirmative-action sexism of using "she" there? This really grates with me, even more so when used with traditionally male-dominated roles, such as physicists or system administrators. Yes, you're freaking out the squares with your right-on craziness, but it's really rather childish. If you (100% rightly) want to be non-sexist, use a gender-neutral phrase, such as in my example above.