I'm guessing they are talking about this from earlier this year:
https://edition.cnn.com/2021/05/16/tech/bill-gates-allegations/index.html
Bill Gates's 2020 resignation from Microsoft's board of directors came after the board hired a law firm to investigate a romantic relationship he had with a Microsoft employee, according
to new reporting from the Wall Street Journal.
Citing "people familiar with the matter," the Journal reported Sunday that a Microsoft engineer had "alleged in a letter that she had a sexual relationship over years with Mr. Gates."
"During the probe, some board members decided it was no longer suitable for Mr. Gates to sit as a director at the software company he started and led for decades," the Journal reported. "Mr. Gates resigned before the board's investigation was completed."