It is well known that Kramnik baselessly accuses everyone. The article seems to be more about statistics than chess, and doesn’t make any accusations. Kind of a click bait title IMO.
I'm just trying to figure out how you even cheat on chess, the only thing that comes to mind is moving pieces, and sneaking new ones on the board, but if there's enough cameras, how do you get away with it, eventually someone WILL notice, highlight it, point it out, and you will be shamed.
Getting any kind of information from a chess engine would be sufficient to gain an edge for a good player. Even something as simple as a nudge that there is a high value move in a position with no information about what the actual move is could be enough. Big chess tournaments tightly control phones and other devices for this reason. That's on a single-match level. On a tournament level there have been allegations of collusion where players will intentionally arrange their own matches to either be quick draws (to get a break to focus on other matches) or to give points to a designated player to help them win the tourney, Fischer famously accused Soviet chess players of doing this.