Electrum also can be used as cold wallet, the developer even wrote a guide about it on
https://electrum.readthedocs.io/en/latest/coldstorage.html, but otherwise you're right. Suggesting to store recovery words on device without mention encryption is really bad suggestion, especially due to risk the device might be stolen. And you remind me of his past nonsense,
Wine is a safe and open-source virtualization solution that allows to run Windows based applications on Linux and the applications on Wine run in a virtualized environment which won't affect the applications that run on the real Linux host system. I believe windows based malware won't impact the host of the Linux system as Windows malware are built in a way that they can affect Windows based users only.
The files and the whole Kernel module of Windows operating system is changed from Linux and that's another proof that Windows viruses and malware won't be able to penetrate Linux operating system. However, it's always recommended to avoid installing any application on the systems where someone saves his/her Bitcoin. Just don't be paranoid by such thoughts the Linux is a safe operating system and Windows malware can't harm it at all.