It also depends on what your personal requirements for forward secrecy are. As a major platform operator Google should aim somewhere towards the top of that distribution.
Why does Google need long-term forward secrecy? They may encrypt my sessions with keys, but most of their data is the huge index of the public web which is, by definition, public. I suppose they dabble in things like health records, but it seems like most of what they store and forward are public.
Google operates among other things an office suite, a cloud platform, the largest repository of location services data in the world and an IoT health/lifestyle devices company.
Any big company has numerous data access restrictions. Some of them are obligatory and external, or required for certification. Even basic HDD/SSD decommission and transfer between projects strongly implies that old data was not stored as clear text.
