They ask the same question regularly, statistically significant changes in answers are very noticeable. Also if people really liked WFH wouldn't they say they were more productive now to try to alter future decisions? But instead people choose to answer that they are less productive.
What would you want to see and why? Do you think this is some puff piece to influence people to want to get back working in offices? Hasn't google already stated that they aren't allowing people back until July 2021 or thereabouts?