That's correct but the logs affect P(people will trust Lamo's current and future stories). If he had told Kevin in May that the purported Bradley claimed to have communicated with Julian, then the same claim made now to Charlie has somewhat higher credibility.
Also just because somebody is untrustworthy doesn't mean they are lying about everything or even most of the time.
Also just because somebody is untrustworthy doesn't mean they are lying about everything or even most of the time.