The point is that the views have their origins in philosophy rather than experiment. We're not dealing with a research program developed from a set of compelling experimental results but a research program that has inherited a set of assumptions from a non-empirical source. This is more obviously the case with computationalism, where advocates have shown almost no interest in establishing the foundational assumptions of their discipline experimentally, and some claim that to do so would be irrelevant. But it's also true for nativism where almost no thought is given to how nativist mechanisms would be realised biologically.