Earlier quoted context omitted.
with the emphasis on Capital (his millions) The joke being "ally" is a term used by those fighting against the injustices of capitalism, and this dude has millions from literally being the Boss and accrued from exploitation. Of course that doesn't matter as he's now a good guy speaking up for the oppressed. It's quite amusing if you believe in anti-capitalism.
Don't let perfect be the enemy of good. It often takes a while for us to internalize and accept how some hard things and maybe he spent years trying to make sense of this problem and finally reached a breaking point.
To clarify, it's not bad what he did, he is the good guy now. To put him up as an example of anti capitalism in its own right (even discounting the fact that the warehouse workers who were sacked are not) is hilarious.
Edits - As most comments in the thread suggest, most people are not seeing this as a form of anti-capitalism at all.