A countdown that resets on reload is a dark pattern, and consumer protection regulators in the EU and UK have fined for exactly this. It is also the single most common scam-site tell.
Impact is importance multiplied by the confidence tier’s weight — SPECIFICATION 1.0, RESEARCH 0.7, EMERGING 0.3, EXPERIMENTAL 0.1. Two rules backed by the same class of evidence therefore always carry the same weight, which is what makes the score reproducible rather than hand-tuned.