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YouTube has found a new way to load ads | AdGuard Blog
(adguard.com)
This is a most excellent place for technology news and articles.
They're not referring to the YouTube ads, but the "let's take a minute to talk about today's sponsor nordvpn that I used on my trip to Antarctica." This is a part of the video file itself, and it starts and ends at the same time for all users.
Except it doesn't when a YouTube ad is injected in the middle. Then all timestamps after the ad are offset by the length of the ad. That's not from me, that's from SponsorBlock themselves in the OP.