That was more the vibe I got too with the Fisher quest line, especially because it was the later quest after you would have used the Crystal Tower to time travel. I seriously doubt Sharlayan has their separate time travel device but it's completely plot irrelevant except for a through-away line. Now theoretical time travel and some minor experiments? Depending on the canonicity of the Astrology Job Quest, plausible. And how much they studied or knew about the Enigma Codex.