Isn’t the argument from women’s testimony overstated? Women could testify in some circumstances, and if women prepared bodies, women finding the tomb is exactly what you’d expect.

The overstatement is a fair correction. Women’s testimony was not legally void, but it was discounted (Josephus and the Mishnah both say so), and the Gospels themselves record the male disciples dismissing the women’s report as an idle tale. The point only needs women to have been less credible than men in that culture, which is well documented. As for the natural-role argument: a story built for persuasive effect would have women find the tomb and then give the first appearance to Peter or John. Instead John’s Gospel gives the first appearance to Mary Magdalene. That is not the choice a fabricator makes.