Hi @michaelvera
As the paper explains, the pre-registration, paper, dataset, and analysis scripts are freely available (https://osf.io/wj34h/), making the research about as transparent as it gets — certainly more transparent than most of the evidence we rely on on a daily basis.
If you have doubts that are more supported by their data or others’ data than their hypothesis is supported by the data, then that would be concerning.
But merely hypothesizing a concern about bias without any analysis of any data is not an objection. (In fact, dismissing evidence on the basis of potential bias is itself a bias/fallacy — #theBiasFallacy: https://byrdnick.com/archives/11072/the-bias-fallacy).