I think his point is: rather than "leaning into" it as in, masking through epsilons, he argues that tolerance is fundamental to the problem space, not a way to resolve edge cases.
To me it seems it's used with the intent "They don’t just <do X>, they <do Y>," implying that Y is a proper superset of X. My point is that X is in fact a superset of Y, making the most charitable reading "They don’t just <do X>, they <do X in more words>."
Is there another potential reading of "just" that I'm missing?
I'm wondering if people have heard the expression "leaning in" from people who were insincere/lying, and assumed that that was what the phrase means?