I trust Vegas more than the MSDNC.
All articles I found about Biden bets being paid out are from the same Aussie book. Media loves that the one bookie in AU that had minimal exposure paid out early and said you can keep it even if Biden loses.
Vegas has not paid out yet. Pics related are the payor’s website and a US book’s explanation of why not yet paying out.
AU book:
https://helpcentre.sportsbet.com.au/hc/en-us/articles/360052142091-Joe-Biden-Early-Payout
US book:
https://betting.betfair.com/politics/us-politics/us-election-betfair-market-settlement-latest-051120-204.html