Really? Wtf kind of incompetents were arguing that it couldn't be done?
I'm not arguing that it was or should have been easy, of course. It sounds like a fascinating challenge. And I'm also not claiming that any computer scientist, even a good one, could have solved it. But any vaguely competent computer scientist should have been able to say, "that's a cool problem, and you need to talk to a graph drawing expert."
Of course, this could have been a case of the source saying "they said it was hard" and the writer mangling that into "they said it couldn't be done". But still.