I actually think the specific promises are a good thing. They are measurable, concrete actions that are time bound --- "By such and such a date, we will have done thus and so." Like concrete OKR's, you can tell whether or not they will have done what they said they are going to do.
You can also make vague statements such as "there is no place for harassment at $COMPANY"; those statements were made earlier, and they were made today. But concrete steps like "making arbitration optional, instead of mandatory" is one of the things that engineers who participated in the Walkout had demanded. So it's certainly something substantive.
Now, there were some specific requests from the employees that were not honored, such as treating Temps and Contractors the same as Employees; legally that really can't be done except by hiring the Temps and Contractors and making them employees. I personally would invite other companies, such as (for example) Facebook and Apple to lead by hiring all of their cafeteria workers and stop using contracted labor. Maybe Google will lead by example, even if it impacts expenses, and therefore earnings, and therefore the Stock Price. But it's certainly within the power of other companies, like Amazon, Microsoft, Facebook, Apple, etc. to also lead by example.....
Wait, what? Is that Crickets that I'm hearing? :-)