They're making a bigger deal about it than it actually is
If, however, the court’s decision frees future presidents to act in corrupt, even criminal ways, then the “rule for the ages” articulated in this opinion will have a major impact upon the separation of powers among the three branches of government, potentially giving far more power to the president than has been the case throughout American history. That will have huge implications for the functioning of the presidency and the stability, if not existence, of American democracy. source
It’s a big deal. Of course Biden would rather talk about the case, it undermines the entire democracy. His age will continue to be a focus of the election, Republicans will not let it go.