I gave access to the greengeeks support team to my dashboard. They came back with this 2 things:

From what I can see, the items you mentioned earlier now indicate that everything is functioning correctly: 

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DB cache = On (File-based cache engine) - OK 

Pages cache = On (File-based cache engine) - OK 

Page blocks cache = On (File-based cache engine) - OK 

Templates Cache = On (FileHtml-based cache engine) - OK

-Regarding the issue "To apply this optimization you need to have deflate_module - FAIL (you will need to install deflate_module for Apache)", your website is utilizing the more modern "Brotli" optimization rather than "Deflate".

I still cannot update to RC2. I guess I would continue using (for now) the stable version.