Statistical errors undermine claims about the evolution of polysynthetic languages - a comment on Bromham, Yaxley, Wilson, and Hua (2025)

We identify major flaws in the statistical analysis of Bromham et al. (2025), whose claims about polysynthesis and phylogenetic isolation rely on incorrect implementations of Bayesian model averaging and spatial filtering. Reanalysis using appropriate methods shows that key predictors lose statistical support.