It's interesting to see him being accused of being "socialist" or "communist" when his decision seems to flow from his conservative Christian upbringing.
Interesting and even nonsensical. He's an entrepreneur, owns a for-profit business and is choosing to compensate how he wants to. It's actually the definition of how capitalism can improve quality of life for everyone, is it not?
Not really, because he's pushing towards a completely arbitrary minimum $70k salary for everyone. That's certainly his right as the business owner, and that sentiment shared more widely might be better for society, but there's nothing particularly "capitalistic" about it.
It's his money, he's the capital-holder, he can do what he wants with it. If he thinks it's better for his business to do this, that's entirely up to him.
Capitalism doesn't mean "pay your employees out according to some made-up scheme of who's-worth-what," though the weird calvinist pseudo-capitalism we love in the U.S. sure likes that kind of ranking.
It's absolutely capitalistic, but there are many people who would call it economically inefficient or irrational. After all, a capitalist can choose to freely exchange his capital for higher-priced goods of the same quality as lower-priced goods instead of those lower-priced goods.