As far as I can see, the claims are so nonsensical as to be equally (non)applicable to a notebook or a text file.
- Neither needs backups. In fact, a text file is much easier to back up if you want to.
- Neither is particularly likely to be corrupted these days, but a notebook can just as easily grow moldy as a text file can be corrupted by a disk error.
- A thief can just as well break into your house and steal your notebook as a hacker can break into your computer and steal your text file.
- A pretty large chunk of computing is done on devices with a battery these days. Depending on the time of day, a notebook may not actually work well at all during a power outage.