So far in this thread there has been a lot of discussion about whether they can be corrected. Unconscious bias is just that--unconscious. I suggested that people who over time have seen their biases revealed can make improvements in regards to their thinking and action. And those who spend time reflecting can over the years make great progress in this regard.
This was particularly in connection to the discussion of unbidden thoughts that surface and can then be analyzed. I am not sure if you have read all of that discussion.
Some here took issue with Ana that he does not claim to have unbidden racist thoughts surface. Yet, if you really can improve in these areas, rigorously challenge your preconceptions, etc. and if, as he noted, he had an upbringing that early on set him on a good course in this regard, why couldn't he be at the point where he is not having racist thoughts pop into his head? Instead of accepting his statement they insisted he was defensive.
As to subconscious bias, by their nature you can never know all the decisions being made by your sub-conscious. Studies can reveal particular ones for particular people. But even if I have participated in bias studies of a few sorts, there still are all kinds of blind spots I may have as to my subconscious.
That is why I stressed that the best course we can take is to whenever possible design systems that weed out potential for bias. I gave the examples, as discussed from other studies and threads, regrading anonymizing job applications, or blind auditions for musical groups ,etc. as examples that eliminate the possibility of bias based on groups or appearance. These types of systemic changes are what you would need, when possible, to weed out unconscious bias in a meaningful way.
Now in regards to children, they are not ready to analyze systems for society. You can teach them each person has value, should be treated fairly, etc. But they are not ready to think through the notion of a sub-conscious that is making judgments behind the scene that are not something they can directly analyze, and that could be harming others without them even realizing. They don't have the ability to manage that.
If you look at the article you posted most of the ways they were to learn about bias were dealing with manifestations of bias through behavior. We have always needed to teach kids about treating people fairly, that everyone has value, dispelling stereotypes, reviewing behavior, etc.
Teaching kids that their sub-conscious will betray them is not a helpful lesson at that age. They have not even learned to regulate the thinking and behavior they are aware of.