Your take is certainly possible, but it's also possible (And I lean more toward this) that the thief found a way to get the pod to leave the 22nd century bound for the 24th, & return back, but couldn't manage to get around what might be a timer set as a standard, for that time jump, or maybe any/all time jumps.This is an odd formulation: why "is" the timer programmed in the passive sense? It sounds as if the thief had little say in this respect.
Also, what would be the logic of the thief setting an auto-return with a "timer"? Why not just hit the relevant "go now!" button? There is no tactical benefit to using a timer, and as shown, using it poses a massive risk to the thief and his operation.
Hence the possibility of the legitimate time pod owner being behind the timer setting, and the need for a reason for him to wish to return to New Jersey after visiting the E-D (or the dying planet, which had no E-D anywhere near it those "weeks" ago when the thief said he was still/already struggling with the controls).
Timo Saloniemi
Like I've postulated earlier, the whole idea that he'd find the 1701-D in such a specific place, & have at least some info about it, kind of hints that the real historian was likely planning a trip to there & then, which means the trip itself might already have been preprogrammed to some degree, & the imposter stumbled onto that, & figured it would make a useful heist. The exit destination might have been easier to reset than the timer, which might be a general protocol the historian observes for some temporal directive reasoning.
So then if the timer is a hard set kind of generic program, how did the imposter stop the ship from a timed-out departure in his own 22nd century's time, long enough to have a few weeks to tinker with it? Well, at that time, he also had access to the owner, who he could've held hostage until the timer was going to run out on him, leaving him no choice but to cancel it himself, at which time the imposter could dispatch with him
A time machine being put on a timer at all is a pretty shitty deal for any time traveling. If it is on one, it must be there for a really good reason, like temporal prime directive type stuff maybe