You are right that these forum are meant to spread the word on known issues. Thanks for letting us know of this potential dealer repair/replacement program.
As far as your concerns over if they should be recalls or not. Recalls are a federally mandated program. They are mandated by law for any safety or life endangering issues. It is very rare for car manufacturer to not respect them, but it does happen. As sm1ke mentioned, in addition to dealer repairs, car manufacturer also have technical service bulletins (TSB), which are distributed to their dealers. These covers a multitude of subject from known repair procedure for common complaints, parts improvements and mandatory parts replacement for non-safety issues. If you are curious, they are all available on the NHTSA website. There are currently about 285 technical bulletins for the cx-9 2016, which is likely to be about a normal number at this time and for a first production year vehicle. The 2012 Passat has 850 currently.
I would say in your case what I find lacking is the lack of explanation from your dealer. They should have been more open about which technical service bulletin the work was done under. Depending on the reason for the noise, I would say it was determined that there was no chance of your wheel falling off

so it was not made into a safety recall. Depending on the nature of the TSB, the repairs are sometime done for free under warranty, so your extended warranty may not have been involved in this case.
Without more details, it is hard to pinpoint your exact repair, but here is an example of a TSB for replacement program under warranty of rear coil spring on certain Mazda CX-9 2016.
https://static.nhtsa.gov/odi/tsbs/20...36327-9999.pdf
Here is the link for all the TSB under the «*manufacturer communication*» section of the page.
https://www.nhtsa.gov/vehicle/2016/M...Communications
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