Has YouTube Been Manipulating Their Video Transcripts?

YouTube constantly lectures us about spreading supposed misinformation. However, isn't the manipulation of video transcripts a YUUUUUUUUUGE example of spreading misinformation? This video presents evidence that YouTube, in the case of Marcus Arbery saying the "taboo" words "all lives matter," has used its transcripts (reflected in its closed captions) to hide that inconvenient phrase.

And if YouTube has been manipulating its video transcripts in this case how often has it manipulated the transcripts of other videos in the past? Inquiring minds at the Senate Commerce Committee would like to know especially next year when it changes leadership.