The main differences between an Influence Score and WoT scores are that Influence Scores also keep track of context and degree of confidence in the score. If explicit attestations like you describe don’t exist, then we use whatever information is available. If follows and mutes and likes are the best we have, then for each one we infer a score, context, and confidence and feed that into the Influence Score calculation.

Example: if Alice “likes” an article by Bob in wikifreedia on Category X, we interpret that as a trust attestation with score: 100, context: Category X, confidence: 5%. 

I have some posts from a few hours ago saying this in more detail.