That depends on your motives... they believe that all information should be available to them so they can leverage that information to make a squijillion dollars. Nothing about that mandate suggests that all information should be available to all... information wants to be free - to them. The fact we all want it is not their concern. It is not in their financial interest to give up that information to anyone, it doesn't further their bottom line, which is the only real mandate they care about. If they could monetize salary transparency, trust me, they would have made that information free too.
In fact, it potentially hurts their bottom line because then they'd have to have pay equality amongst their ranks - and I don't mean pay equality from a male/female standpoint (though that is a concern), I mean from an employee to employee standpoint. Pay transparency gives everyone an equal footing on the negotiation playing field. This also means that even the worst negotiator in the room can potentially earn the same as the top superstar on the team. What do you think that does to Google's bottom line? They could have been paying the superstar with the shitty negotiation skills peanuts to earn them millions, now they've gotta pay him the same as the pretty good developer with excellent negotiation skills because he has them over a barrel and he knows he is the only one that has the ability to provide what they need to get where they need to go.
I wouldn't say this is hypocritical, this is accounting. Accountants want to keep the bottom line at the absolute minimum. When this means paying people different amounts to do the same job, salary discussion pisses people off. In the interest of keeping the peace and getting the job done, salary discussion must be suppressed or people figure what they're worth amongst themselves and they have more negotiation power. More negotiation power causes the bottom line goes up, counter to the accountants' mandate. You would have to completely upend accountants' viewpoints on capitalism to turn that perspective around, and until you do, law or no law, practices like this will continue.
Salary negotiation since the dawn of capitalism has been like a game of poker. You need to figure out their motivations and what value they're trying to extract from you. Once you know what your value is to them and what return on their investment you are capable of providing them, the negotiation begins. People make the mistake of comparing themselves against others in order to negotiate their salary when in fact it comes down to the game you play at the negotiation table. The game is to understand what value you provide to the company in the role you're pursuing and figure out a number you're both comfortable with. Too high and you don't get hired, too low and you get exploited. It doesn't matter whether you're male or female, it all comes down to figuring out the value they know you will provide them and exploiting that.