I am treading on @evograd’s territory here, but his mutation-rate claims are filtered through a mathematically faulty lens to convert mainstream data into something that looks like it fits YEC.
But that is a good point. If he wanted to show that his model was robust and useful, he could make predictions of mutagenic drift, base pair difference counts, and so forth in yet-unstudied species. These predictions would need to be different than the predictions of the mainstream model. They would need to be definite. They might take the form “My model predicst that once the genomes of (insert two species here) sequenced, we will find it has mtDNA BP differences on the order of 800, as opposed to the ~50 BP differences predicted by (insert actual mainstream research here).”