What was promised where? Because yeah, get capable technical team together who are excited to share a project they’re working on, and they are bound to be optimistic about what could be realistically implemented over a long timeframe. Nothing but the official release product information should be considered a promise, and nothing but unsponsored, unaffiliated reviews should be taken as proof.
I highly doubt that any pre-launch ‘promises’ were made with an intention to decieve.