The "21 fixed" refers to the specific corrections made to address issues such as:
“I just watched the version of the Spirited Away English dub, and the difference is night and day. Earlier releases had the audio drifting noticeably out of sync during the second half — especially during Lin’s dialogue and No-Face’s chase. This version locks perfectly from the opening car ride to the final goodbye. If you’re archiving Ghibli dubs, this is the one to keep.”