Your post only discusses how much money Biden made during his time in office. He didn't make his millions until after he left office.
Thought I covered this but if I did not, here you go:
Joe and Jill Biden signed a multi-book deal with Flatiron Books in the “high seven figures,” according to Keith Urbahn, a literary agent who specializes in political books.
Rumor has it the book deal was for $8 million. Altogether between 2017 and 2019, more than $15.6 million from speaking fees and book deals.
Another house that Biden bought in Wilmington, Del., for $350,000 in 1996 is
now worth almost $1.9 million, according to an estimate by the real estate website Zillow.
Based on Joe Biden's real estate holdings and book deal, Joe and Jill Biden have a total net worth of between $7 – 9 million.
In February 2017, Joe Biden was also named the Benjamin Franklin Presidential Practice Professor at the University of Pennsylvania, a post that earned him a $372,000 salary that year.
Both Joe and Jill Biden were paid and continue to be paid Social Security that currently for both combined amounts to $54,665 and $27,332 each, (the max individual Social Security per year is $43,524 X 2= $87,048 so theirs is not that much).
The Biden's are most likely going to be even better off financially when he leaves office. Since being elected President, Biden's income is: As former Vice President Biden gets pension of $161,490 for life. The annual salary awarded to the President of the United States is $400,000 plus an expense allowance of $50,000.
It occurs to me if Joe Biden’s wealth was a result of influence peddling and they engaged in complicated financial transactions to hide these payments and avoid scrutiny, they must have done a poor job of hiding it since his detractors seem to think they know how much of his wealth was a result of this.