You and the sibling commenter are definitely correct, this construction method definitely appears to be preferable to just killing the road for a year. My qualm specifically is that the title doesn't really tell the full story (clickbait). I, at least, clicked it because I wondered how they could possibly have done all the prep and work in that sort of a window and the answer was they couldn't, but they still got my click.

So Usain Bolt can win gold medal in Olympics under 10 seconds totally disregarding all training he spent time on.

So all that matters is people watching it on TV?

I disagree much, because building site was there for months and road below was hindered all the time. Highway was maybe operating without closing lanes but that is not the full story there.