RFK jr is a serious threat to the Biden campaign. He's already polling over 12% nationally with mostly would-be Democrat voters. That's enough to guarantee a blow-out win for Trump.
Discussion
Yes, if Trump is in the race. They are putting a lot of their eggs into the removal of Trump (I do not believe Haley officially conceded). RFK is just a bump in their current road and nothing more than a secondary threat. They remove Trump, they remove both threats.