I think this was also a “look what we can do at short notice” kind of exercise. Just in case a country was thinking of maybe trying to take over another set of islands in the south Atlantic
The distance of 2700 km a typical small ship - like say this Costa Guard cutter https://en.wikipedia.org/wiki/Legend-class_cutter and sure South Africa do have ships like this - would have made in 2-3 days. No risk and probably much cheaper compare to the described paratrooping.
Though i do think that the paratrooping was nice, just to show that as a civilization we can.
On the other side i think it also shows our civilization failure to develop long range VTOL - say like this https://en.wikipedia.org/wiki/Piasecki_16H_Pathfinder - helicopters with pusher have been reaching 2000 km range, and additional fuel tanks would have gotten such one to 3000km, yet we just don't have such helicopters (or other long range VTOLs) around.