Marc Benioff is a progressive and has been quoted many times saying the same thing about his own workers.
It's unwise to think of business owners as left or right leaning, or to think their espoused politics are any indication of how they will act when push comes to shove. Owners are always perpetuating class war against workers.
I disagree: tech leaders may be left-leaning on social issues, but they are not left-leaning fiscally. Corporate America as a whole - tech and media included (Fox, NYT, CNN, NBC) are center-right on fiscal issues. Tech companies may dress up their logos in Pride colors at the right times since that's free and earns goodwill.