There's a lot of misinformation going on in the Reddit thread. These "Heroes" get better tools for flagging videos faster (among other things), but it's still just flagging. Every flag still gets reviewed by a human at YouTube, according to their documentation:
> YouTube staff review flagged videos 24 hours a day, seven days a week, and videos that violate our Community Guidelines are removed from YouTube. Videos that may not be appropriate for all younger audiences are age-restricted.
> Flagged videos are not automatically taken down by the flagging system. If a video doesn't violate our guidelines, no amount of flagging will change that, and the video will stay on the site. [0]
And that documentation is still true for the Hero program:
> As always, the policy team at YouTube makes the final determination of whether content should be removed. [1]