From the very beginning of the article:
"The gist, as it always is, is that Apple is being super petty and trying to force customers to upgrade their phones by making their old phones run slower.
As always, the answer is no. It would be beyond stupid and incredibly short-sighted for Apple to do this and, if it was actually true, would likely lead to tangles of a governmental and legal nature that no company like Apple would ever want to happen.
Instead, Apple is focusing attention on smoothing out the very high and quick peaks of power draw that can cause problems with older batteries."
Now, I've noticed already that the same people that are claiming that throttling for thermal purposes is no big deal are now also trying to claim that trying to control peak power/battery charge is somehow a big deal. In reality, they're both standard approaches to dealing with physical realities (limitations of technology combined with heat, limitations of battery technology).