While he's wrong to say it "doubled," it has risen ~40% since 2020, and the graph he linked is M2 -- the spike in that graph is not due to definition change -- that's actual money supply expansion. You're thinking of the change to the definition of M1, which did cause a really huge spike that was misleading if you didn't understand the change. The converted figures that do adjust the definition in both periods do show this particular spike (as do graphs using only the pre-May 2020 definition).