I think this is a rather useless article. Everyone already knew that the teams performing poorly in the regular season usually didn't make it to the conference finals, often. That's why a lot of the "experts" picked against the Celtics. Then, Hollinger proceeds to use second half record and point differential to separate this year's from the rest of the bunch.
Second-half record and point differential statistics are another form of statistics just like regular season records. They are an estimation of true team strength. They might be a valid estimation of strength. They might not be a valid estimation of team strength. In this case, Holliger does the really stupid thing of considering postseason
seeding. Seeding is a terrible stat to use. Point differential is a much better stat to use, but it's meaningless for individual teams until you corroborate it by watching the actual games.
Frankly, I've read some of Holliger's stuff and his numerical methodology is usually pure garbage. I wouldn't put a lot of weight on his conclusions, especially when it involves complicated stochastic events. (probablity)
Nonetheless, our takeaway is the same. The Celtics' ability to suddenly dial it up for the playoffs has been remarkable, but we shouldn't start expecting this as a normal occurrence. Out-of-the-blue conference champions come along about once per decade, and out-of-the-blue title teams appear with even less frequency. It would be a mistake to glean from this one example that those will now become annual events.
The closing line is pure garbage. The only lesson is that tanking the regular season has never been really tried before. It might set an example for future teams to emulate - to put a greater importance on getting healthy rather than getting good seeds. Cars weren't that common before 1910, but there were lots of them a decade later, and they are all over the place now.