You did not read it correctly. Author stated that people are modifying and redistributing their code in an unauthorized manner.
Because what I see is essentially "they're storing stolen property" but the burden of proof is on the author to prove it was, indeed, stolen.
I imagine the bar for that is pretty high otherwise anyone could weaponize DMCA to target their competitors' repositories.
That's not what OP alleges - they are saying people are redistributing modified versions of OP's copyrighted code. DMCA is an appropriate measure in such a situation, but it's unclear why OP's DMCA takedown was rejected by GitHub. Without more detail, it's hard to comment further
https://reclaimthenet.org/kiwi-farms-dmca-subpoena-anonymous...