In general, of course it is. (I think “couldn’t care less” / “could care less” is an example, though my Inner Pedant gets very twitchy at the latter.) But I think it’s unusual to have such big differences in idiom, and I suspect they generally arise from something that was originally an outright mistake (as I think “could care less” was).
Inserting a ‘not’ where it shouldn’t be is not an American/British difference.
But is it not possible that whether it should or shouldn’t be there is a matter of the dialect of the speaker?
In general, of course it is. (I think “couldn’t care less” / “could care less” is an example, though my Inner Pedant gets very twitchy at the latter.) But I think it’s unusual to have such big differences in idiom, and I suspect they generally arise from something that was originally an outright mistake (as I think “could care less” was).
And in particular, such a twisted usage does not fall neatly across the America/Britain divide.
Especially in this particular case where it was pretty clearly an editing error.