There are many ways to say something, so that one does not incriminate one’s self, and yet the other person ‘understands’ what you are implying.
Such may have been the contents of the conversation between Sestak and Obama.
I doubt we will ever know what exactly transpired between them anyway.
Sestak was asked directly if he was offered a job for quitting the race. His unequivocal answer was "yes." So, while your speculation may well be the truth of it, that is not at all what Sestak has said and said more than once.