It was pretty clear to me that the above poster was "defending YC" by explaining that YC is doing the right thing for their value system; Bob's Red Mill instead

It was pretty clear to me that the above poster was "defending YC" by explaining that YC is doing the right thing for their value system; Bob's Red Mill instead pushed against the capitalist narrative rather than seek to maximize profits and grow at all costs. I think the implicit suggestion which you seem to have missed, in referring to valuing humans above profits as "the cardinal sin", is that it's only a sin from within this framework, which is usually at odds with the opposing framework which values human welfare above company health. Perhaps my own bias is showing, but this specific application of irony (making light of the harms of capitalism by singing its praises while using highly sensationalized rhetoric) is something I do as well.