I meant now; there was obviously media coverage when it happened.

I see. News organizations have a duty to corroborate claims like this before they publish them, so I would interpret the lack of coverage as other reporters being unable to verify anything he said. There is of course still some coverage though: https://www.reuters.com/world/us/prize-winning-reporter-seym..., https://www.newsweek.com/did-joe-biden-attack-russias-nord-s..., https://www.thetimes.co.uk/article/us-bombed-nord-stream-gas...