Please provide any reason or proof for your statement.
I can tell you why "false positives" can be considered out of question.
1. HFS performing a self-tests, connects to rejetto.com (over the internet), providing his own address (hfs' address).
2. rejetto.com connects to this address (hfs), and it makes a special request.
3. If the reply to the request is "hfs ok", then the server says to HFS "1".
4. HFS gets the "1" and knows all is well.
There's no way to connect to an address over the internet and getting an "hfs ok" by chance.