> The document said this could be rolled out without upsetting staff because workers didn’t know what the existing rate was, so wouldn’t notice if it declined.
I really don't know what they expected. You're cutting the salaries of your employees; the best case, yet highly unlikely scenario is that nobody notices. More likely, your attrition rate will increase as Google becomes slightly less attractive for employees to stay at, or the worst case but highly likely scenario is that you have these slides get out and now everyone is unhappy because they're being paid less and having information willfully hidden from them.