Mediation is not guaranteed to generate revenue - it simply allows AdSense to bid on the Ezoic placeholder setup. If they're not bidding more than Ezoic partners (which includes Google Ad Exchange which is a higher level Google ad platform) then their ads won't show, and you won't generate revenue.
In regards to seeing that visitors are reaching non-Ezoic versions, it's down to the date range you've chosen. During that time period we confirmed that there was an issue with pages showing Ezoic versions with our ads - therefore they're not reported as Ezoic platform visits.