I seem to remember back about a year after google became known that there was some commentary to the effect that google was not including all FR posts. Do not know if this was true or if it has changed.
IIRC, there was a period a few years ago when the Google search engine was prohibited from “indexing” FR threads.
That apparently has changed in recent years.
I use Google frequently to search FR.
I just wish Google had a ‘search only before XXX date’ capability. It would help on locating old articles, etc.