Unless Ivan knows more than he lets on, it just seems to be speculation.
In terms of #1, Med is 2000 points behind Djokovic. If Djokovic plays Paris and/or WTF and gets halfway decent results, he should be pretty safe of finishing #1.
I guess he'll play at least WTF. Unless Medvedev wins IW or at least reaches the final, the #1 race may be a foregone conclusion.