To be fair, even Picard can only barely glimpse the hows of the Observers being able to pull people from different times. And even that much is largely due to the fact that he's aware that time travel is possible at least, if not necessarily practical or commonplace. The finer details of how the Observers are able to so seamlessly pull people from wherever they'd been is another question entirely, but to be fair, he rather doubts that they'll have an answer to how they're able to manage that until they manage to learn more about the Observers themselves (which is easier said than done).

"Somewhere with a very different set of native wildlife, yes," he agrees with a nod.

True, he can't deny that some of the local wildlife is similar to that of Earth. But it wouldn't be the first time he'd run into that sort of thing, and there's enough that unfamiliar for him to assume that, by and large, this is some uncharted planet somewhere.