It's not listed in his bio, and he is criticizing Biden big time.
Lawrence Henry Summers (born November 30, 1954) is an American economist who served as the 71st United States Secretary of the Treasury from 1999 to 2001 and as the 8th Director of the National Economic Council from 2009 to 2010. He also served as president of Harvard University from 2001 to 2006,...
https://en.m.wikipedia.org/wiki/Lawrence_Summers