These methods involve using hardware wallets, QR codes, or mesh networks to facilitate transactions offline, but they still require an internet connection at some point to broadcast the transaction to the Bitcoin network for verification and confirmation. Or what's your take on this.?
If we count a mere handing over of Bitcoin for an actual transaction, which we should since it is "sound" money much like precious metals or physical cash, then we can say with certainty it is possible. Tools like Opendime allow for trustless transactions of "physical" Bitcoin, where you fund the device using the Internet connection and then pass it to another person offline without having to broadcast it to the blockchain again. By the way, it will be a pure peer-to-peer and completely anonymous transaction because no one will know who exactly received your Bitcoin due to its offline untraceable nature. As for other methods, they all require an internet connection to make the transaction appear on a public ledger.