The Royale is one of the best comedy episodes in the series IMO.
Yeah they messed up the science. But who cares? It's Star Trek. Most of the science is made up and nobody seems to complain that in NuTrek, creating a black hole increased the gravity at a fixed radius from the center of the planet without increasing the mass. (Unless that red bubbly stuff weighed about ten times the mass of Vulcan! Black holes are not magic supergravity damn it! They're just so dense that you can get magnitudes closer to the center of gravity than you can for normal objects!)
I don't think the aliens' decision is that much of a stretch, by comedy episode standards. No more ridiculous, at least, than Samaritan Snare, which is forgiven because it is also a comedy episode.