I wouldn’t go that far. Don’t forget that the main reason Biden had to be pressured to step down in the first place was that he had effectively been foisted on lukewarm voters and that his cognitive decline had been purposefully hidden for quite some time before the infamous debate.
Yes, it’s good that he finally agreed to bow out of the race, but he only did it after weeks of massive pressure from the media and from within his own party. Without that, he would most likely be the presumptive nominee today and the Democrats would still be getting creamed in the polls.