Looks like it was part of a Rule 10b5-1 trading plan made out in advance, directing when to sell stocks, (like if a price drops, etc), and not 'Oh shit, the ship is sinking so I better sell these stocks now" because he had non-public insider information.
His SEC Edgar file showing his actions as an insider:
The SEC Filings:
๐ Gregory Becker: https://www.sec.gov/Archives/edgar/data/1259867/000156218023002056/xslF345X03/primarydocument.xml
๐ Daniel Beck https://www.sec.gov/Archives/edgar/data/719739/000156218023002059/xslF345X03/primarydocument.xml