While I don't necessarily see a problem landing with CBs in the area in the tropics, and I do agree that doing it in tornado alley (the Midwest or over any set of high plains) is foolish, I think that too much advice is directed in the "don't ever do it direction".
Unfortunately, that sort of advice does someone little good when they arrive over an island with an alternate (and only other airport you can reach) several hundred NM away and minimal fuel. The advice given by Sciolistes is spot on. The rain shower in the video was moderate at best.
Proper usage of radar is hardly ever taught and using the radar to "read" the cell at various levels is something that has gone by the wayside, instead I see many turn the gain to max and point it at 0 degrees, this is probably the 4th most useless thing in aviation.
Now, I'm not a tremendous fan of Airbus, but they have put together a rather good
briefing on how to use radar to your advantage.