...but that's pure speculation, no?
Far more likely to me, though admittedly still unsubstantiated, is that it was "simply" built by large hunter-gatherer tribes in the vicinity. Still has massive implications e.g for how cities came to be originally (supporting the theory of at least some cities having originated from temples/places of whorship), but I wouldn't assume any radically advanced civilisation that got doomsday-ed, at least not without any other solid evidence, such an event.
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Btw thanks @X