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From the article: Rober deleted about a minute and a half from his original YouTube video yesterday, and reuploaded it—something YouTube allows you to do without sacrificing the number of hits a user has accumulated.

Yes: https://www.youtube.com/watch?v=WzuRN1F39IY

You can at least trim content out of an existing video.

only for videos with less than 100k views. his video had millions of views.

He said on Twitter he used youtubes video editor.

Certain tiers of creator accounts are exempt from that limit.

No. Perhaps it's a reupload.