Joeabrams: Your question assumes that Sallie had both the Tyler and Acoustic Zen speakers in her listening room at the same time, which may or may not be the case. Even though the two reviews appear in the same issue, they may have been written months apart. If that's the case, then it's a reasonable choice not to compare speaker "A" to your _memory_ of speaker "B."
Fair enough re Tylers, although many reviewers do include a comment or two from memory (after all, it is not meant to be a full blown A/B comparison, it is mainly a review of one speaker). Spendors are her reference speakers, she might be expected to have a good memory of their sound. Anyway, I can't imagine a reviewer would have nothing else to compare Adagios with. But as I said, I did read the review in hurry. Not a big deal, just struck me as odd and a spoor a reflection othe editor as the reviewer herself.
Tvad: Is anyone going to make a purchase decision based solely on a review in TAS? Not likely. It seems to me readers routinely over-analyze reviews and reviewers' agendas.
I don't know if anyone purchases based solely on one review, but it is one source of information and opinions.