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That link does not work (in Austria); can't connect to this server...

It's an I2P link. It is only available if you use the I2P protocol.

I had to look that one up ;)
Maybe I feel too safe, using Linux only.

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Disable booting from external devices!
Fancy!

There are a great many examples of commands on the link I provided, but it recommends what you have done, and suggests further research.

" You should perform as much varied research as possible and not rely on a single source of information. One of the largest security problems is the user. These are links to other guides that I find valuable:

Arch Linux Security wiki page
Whonix Documentation
NSA RHEL 5 Hardening Guide (slightly outdated but contains useful information nevertheless)
KSPP recommended kernel settings
kconfig-hardened-check