We don't believe they had any access to start with. He's making an excuse about why he got caught, if it's even real. If you see the original posts you can see he submitted heavily redacted, no context, straight incorrect 'proofs' of this too...
Their basis for it being our fault (you allegedly KILLED someone, how the fuck is it anyone's but yours?) is that they seized a GrapheneOS device, had zero confirmation or anything the data was accessed, they got released, and then a warrant arrived again later. People can be brung back in for any particular reason...
His Telegram page is gold btw, has a bunch of screenshots of cryptocurrency transactions and mass mailer apps. Sounds like he made his money from phishing scams and got caught with the wrong guys... Up those charges!
He is assuming because he didn't expect another warrant because apparently his lawyer said it... Keep in mind lawyers aren't cops and only know as much as the suspect does who is already an unreliable narrator. He isn't going out investigating a crime scene.
