oxid.it insecure?

I did a google search on security concerning Remote Desktop, and one of the hits was a pdf from oxid.it. When clicking on it I got a "google warning message" that content from this source could harm my computer.

Is there any record of this site having intrusive web content, or is the warning simply based on the fact that some of the advice/procedures given dig deep into security issues, to the extent that you may harm your own security if you don't know what you're doing?

Could there be other reasons for Google to warn about this site? (Authentic warning, or ulterior motives for warning?)

I have used some info and software from oxid.it, and have not experienced any objectionable or undocumented features. Did I miss something?
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