Just for the record, I can confirm that this is legit.
Took me some time to find a vulnerable server. If you want to give it a go 85.214.146.170 is vulnerable and you can find more using pnscan:
pnscan -w "GET /phppath/php HTTP/1.0\r\n\r\n" -r "500 Internal" <iprange>/<subnet> 80
Notice that not all of the results are positives.