It seems a rather sexist term to me. Yes, the men in the article were very patronising and sexist, but to extend that to all men, or a 'typical man', by giving it the name 'mansplaining' seems pretty sexist in itself. I note the author doesn't actually use that term in the article.
If there existed the term 'womandriving' which meant driving without sufficient care or spacial awareness, I think we would all object to that, as it implies all women, or the typical woman, are poor drivers. I can't see a difference between that and 'mansplaining'. I don't think it's something most men do at all, my dh doesn't, nor does my father, nor any of the men I work with.
If a man explains something in a patronising way because his listener is a woman, by all means challenge him on it as we should when presented with sexism, but lets not let that one example make us view all men in the same way.