As far as I can tell NSC simply downloaded and reuploaded the video I had put on Twitter. In which case it was screen recorded off the highlights video that’s on Youtube on the official Premier League page.
FWIW, my account is still there, but the video is region locked. The fact my account is still there suggests there’s more to it than just uploading the video but it could be a case of it happening more than once on the NSC account.