This seems more like coincidence than anything based on facts around how consent is working on the site.
Mediation relies on AdSense outbidding Ezoic partners. Over time, we always expect Mediation earnings to decline, but overall earnings to improve. That's a natural and expected progression when using Ezoic ad services.
There's also no indication that session related ads have stopped showing on the site. In reality, your traffic has declined fairly considerably in the last week or so - which is why you're earning less.