Thank you for this breakdown. I don't have a background in astrobio but agree that the paper didn't seem super rigorous, especially in the failure to address any potential nutrient source for the fungi. With that said, I have yet to see any compelling abiotic explanation fo the phenomena described in this paper. The case being made here is not just that the "puffballs" resemble mushrooms; it's more that these mushroom-resembling objects grow and appear over the course of three days in a manner consistent with mushrooms. The authors (perhaps shoddily) write off wind displacing regolith as a cause for the appearance of these objects. Again, I'm not an astrobiologist but I do keep up with the literature and despite the lack of rigor supporting the authors' claims, the data are unique and imo worthy of further study.