Google has fiduciary duty to not lose money unnecessarily. The corporate policy is completely different from legal defense when sued.
It's worth noting that people don't like doing business with hypocrites either, so Google has a fiduciary duty to avoid pissing its customers and employees off by systematically eroding their rights through legal arguments as well.
In the same way proposing laws that would limit legal tax evasion loopholes and using those loopholes is not a hypocricy. They work at different levels.
Wanting to change rules (laws) so that everyone must play with the same rules and using rules until they are changed is not hypocrisy.
Court battle is like debate competition, you can use arguments you don't believe in.
Except that court battles have consequences. If you use an argument you don't believe in for a debate competition, you aren't going to overturn laws designed to protect people from those with more power. If you do it in court, there's a possibility that you're going to make many lives worse.