In 2016, Trump won Michigan, Pennsylvania and Wisconsin (and the presidency) by a combined 77,744 votes. Right now, Biden is ahead in those three states by three times that margin - 233,001 votes.
However, if you go by the closest raw margins that put Biden over the victory threshold - AZ, GA, WI and #NE02 - Biden's combined margin of victory is just 66,702 votes right now.
In other words, Biden is winning the Electoral College by a closer raw vote margin than Trump '16.
In other words, Biden is winning the Electoral College by a closer raw vote margin than Trump '16.
To sum up: Trump lost the popular vote by 2.9 million votes in 2016, whereas Biden is on track to win it by 7 million+. But Biden won the Electoral College by a tighter raw vote margin.