Why not draw a straight line sloping slightly upwards towards the north side?
Basically, there's a gap near 74 on the north side, and if you think that actually means something then what does it reflect in the real world? If it doesn't mean anything, then the claim of statistical significance seems fishy.
Andrew Gelman by the way, is the father of the MCMC (Markov Chain Monte Carlo) engine STAN (together with Bob Carpenter ).
"What I am suggesting is a two-step: the authors retreat from their strongly model-based claim of statistical significance, and the journal accept that non-statistically-significant findings on important topics are still worth publishing."