Did/Does Wix have an importer for the given source system? If not, my gut tells me your assumption that this is trivial and could easily be done via selenium is

Did/Does Wix have an importer for the given source system? If not, my gut tells me your assumption that this is trivial and could easily be done via selenium is wildly optimistic. In fact, I would hazard a guess that if selenium is involved in any way, that solution is a mistake. Just as a worst case hypothetical, what if each of those blog posts was static HTML generated by hand?