After the Grealish saga with his release clause being common knowledge at C115y, surely we wouldn't be so stupid to have it written into another player's contract. Surely?
Stupid doesn't come into it.
We want him to sign a new contract because we are worried about the depreciating value of our asset, he is able to dictate the conditions under which he'll agree to do so.
That doesn't mean there is one, but if there is then it presumably means that it was a condition of him agreeing to sign. It won't have been the club that suggested it, if there is.