It sounds like you are unfamiliar with the concept of a protected class. Those characteristics that are protected by (US) law are generally the ones that companies focus on in this kind of data collection.
So rest assured, companies won't treat chin diameter the same way they treat race and gender in an imagined "agenda towards absolute equality in all aspects of life".
No, it just means they couldn't have stopped digging at that point. Having dramatically reduced the search scope to a small number of people, they would have just needed to find one other small piece of evidence to narrow down the group suspects further.
One might say that the original fault was to include a battery that was somewhat too small, so that after a bit of normal wear, the battery was no longer able to provide the voltage required for demanding situations (e.g., launching the Camera app).
Fortunately, they learned from that mistake and started to make iPhone batteries significantly more powerful. As a nice side effect, even a two-year old iPhone XR, for instance, still has excellent battery life today.
So rest assured, companies won't treat chin diameter the same way they treat race and gender in an imagined "agenda towards absolute equality in all aspects of life".