Not just because it (supposedly) ‘contradicts’ common ancestry, but because it really has been done to death. Just look back through this thread, or the many other threads in which you’ve brought up Ewert’s paper.
It does, though. Convergent evolution is also seen in humans (e.g., Norton et al. 2006; Witt and Huerta-Sanchez 2019) and in cancer cells (Pienta et al. 2020). No one doubts that human variation and cancer are the result of natural processes, so it’s actually expected that convergent evolution would occur on common ancestry. It’s not evidence against common ancestry.
And anyway, Ewert’s paper doesn’t actually answer any of the evidence brought up in this thread. The distribution of gene families has exactly zero to do with ERVs or ancestral convergence. Although his dependency graph model is certainly interesting, it is totally unrelated to anything in the OP. So I can only conclude that either you are purposely trying to change the subject, or you still don’t understand the significance of ancestral convergence.