2. The probability of panspermia will still not be 1, or even approaching 1. That leaves enough room to avoid "bullshit argument" in favor of "questionable argument," which is a caveat Bostrom (and Hanson, in his Great Filter) would happily agree to.
3. Even if single-origin life has seeded multiple planets, if the seeding occurred far enough in the past and widely enough, that still leaves us with an anthropic filter problem.
