Really?
Since 1932 there have been 11 Presidential Elections with an incumbent. Of those 11 only 2 have lost, Carter and Bush.
Turnout ranked based on % Turnout of those eligible to vote.
The first five (highest turnout) the incumbent won.
Then # six the challenger won.
Then the next 3 the incumbent won.
Then the next 1 the challenger won.
Then ranking #11 the incumbent won.
So no, record turnout typically favors the incumbent.
In fact there have been 22 Presidential Elections since 1932.
Again based on ranking by % turnout of those eligible to vote.
The 1992 election the incumbent lost, it ranked #12 in voter turnout.
The 1980 election the incumbent lost, it ranked #17 in voter turnout.
So, you didn't even make the top half.
These statistics aren't difficult to find.
Those marked in yellow are the years the two times the challenger beat the incumbent.
View attachment 86534