I agree with David49, and I am also not sure it is correct to say that Marine Le Pen would not have become President. Stranger things have happened in France.
I see the problem now as being that many aspiring French politicians will have to lie low and tread carefully because many aren't squeaky clean! For example, the Prime Minister, Bayrou, was acquitted of the same crime as LP, his being given the benefit of the doubt over his involvement in fraud. (He had to resign as Justice Minister, (the irony of it!), only one month into Macron's reign).
Because Bardella is young, it might be impossible to implicate him in any previous shenanigans, so he can walk tall.