Yes, they violated the license. [0] They just stole his commits and changed the name, like some sort of cartoon clown business. The license requires conspicuous copyright attribution and statement and explanation of changes. Meaning, not just some untrue one-liner buried at the bottom of a wall of text. What they've been doing is obviously not in line with the terms of their use of the code.

[0] https://opensource.stackexchange.com/questions/4577/does-gpl...