Earlier quoted context omitted.
That is not "lowering standards" for diversity candidates. It is giving them more opportunities to be measured up to Google's high standards.
It is lowering the standard for a certain kind of treatment. Whether or not that is justified or relevant to the hiring decision is a separate discussion. A standard is lowered. Full stop.
The original use of the phrase "lowering standards" implied that Google would forgo hiring someone of high skill to hire a lower skilled but more diverse candidate. This is not happening.
Diverse candidates are given more opportunities to have their skill tested, but they must meet the same requirements as anyone else.