Kramnik has a habit of accusing people of cheating without evidence https://en.wikipedia.org/wiki/Vladimir_Kramnik#Anti-cheating..., he has also done this to many many individuals without evidence (and cheating is taken very seriously), this is in connection to that - he's being penalized for accusing people (repeatedly) without evidence.

Just to be clear – this is an event where he has been doing so repeatedly, accusing people of cheating without evidence in-and-of itself isn't forbidden - since cheating in chess is difficult to verify, it's the manner and fashion to which Kramnik has done this that has led to his suspension