how would they scan the inside of a password protected zip archive? the whole purpose of the password is that nobody can open it without the pw. you can may look at the zip archive self and check the checksum or maybe filenames, but not open and extract the files to check them (images etc). specially not if you maybe even use rar archives who are even more secure and you can protect even filename lists etc.
this isn’t working since YouTube inserts the ads at random at random location in videos. so each user gets ads on different videos and locations in the video.
sponsorblock works specially because the locations in the video stay the same. But with this random inserts by youtube this also can break sponsorblock since now the locations of sponsorblock segments change too if ads are inserted.