ATS Pristine Noida: How reliable are possession dates?

Came across a video on ATS Pristine in Sector 150 Noida. The apartments and penthouses look pretty sharp. My main concern is the possession timeline they're hinting at. Builders often promise quick delivery, but how often does that actually happen? I'm always a bit wary. Has anyone bought into an ATS project before? What was your experience with their actual delivery schedules? Just trying to set realistic expectations here.