Thanks for sharing the information.
I used to use
https://searchenginereports.net/plagiarism-checker/ : it's very useful and help me many times find plagiarazed contents. When i tried to check the post you mentioned i got 7% to be plagiarazed. With
http://plagiarisma.net/ it gave me 23% but it took too much time loading. I don't know how those services work or what techniques they use to exactly differentiate which is the best and which is the good but what i want to say here is that the proof of plagiarism could be proven in both of the two tested checkers; may be i should use the fastest one for a daily use.
Sorry for broken english