Well... it could be a coincidence. It's a fundamental concept that any poker player knows. This is a very common way of explaining it.
I'm less concerned about it being plagiarism than the extremely low quality.
EDIT: Although after looking a bit harder, I think it's not unreasonable to suspect plagiarism... But there seems to be some care taken to disguise it... Also probably a language issue that will make a lot of it hard to work out.