Everything is done OFFLINE, so it would be impossible for an attacker to gain access to your private keys generated.[/quote
The issue here is that having a completely air-gapped device is not necessarily a straightforward thing to achieve. There is a degree of technical knowledge required and should really require the physical removal of hardware. Many people don't do this though, and simply turn off their WiFi or Bluetooth, which isn't really airgapped but many people think it is. You should format the device and install a brand new clean and verified open source OS, but again, many people just use Windows and some don't even format it at all. There is a risk that you accidentally re-enable some piece of connectivity in the future and completely ruin your airgap.

Meanwhile, a piece of paper is a piece of paper. There is no middle ground and no room to compromise. It is always offline.

Genuine question: Has he ever recommended a specific brand of hardware wallet? I'm not aware that he has, and if not, then it would be an incredibly ineffective campaign for any specific hardware wallet manufacturer to promote users buying any hardware wallet.