The original article is somewhat wrong or at least misleading regarding the compatibility of Type F (Schuko, German) plugs with Type E (French) sockets: "Type [...] F plugs will also fit in type E sockets". Actually, they won't. Type E has a protruding earth prong that sticks out from the socket. To fit, the plug needs a corresponding Opening. Type F has no such opening, so you cannot physically connect.

Also, French Type E has a round outline which won't fit into Type F sockets because of the non-round outline of Type F: There is a notch on the left and right side of the circle, making them incompatible, but the original article doesn't show that, the drawing of type F is simply wrong.

The plug that actually fits (and is common with most new appliances) is CEE 7/7, a hybrid of types E and F: https://en.wikipedia.org/wiki/CEE_7_standard_AC_plugs_and_so...

All in all, the original article is a bad overview and you shouldn't rely on it, because it will be trouble at least in Type-E/F-land. If this is an indication of the overall data quality, avoid using this page for anything.