Ahem, sorry but, from how Joseph Staten talked about this, it was clear for everyone the space they showed would be playable:
https://www.youtube.com/watch?v=V9YoJjdEBv8
I'm a Halo gamer since the beginning, so I know Bungie always made their skybox with real geometry rather than 2D pictures, but in Halo, they never told it would be playable terrain, just it was real landscape geometry.
A lot of people, including me to be honest, were blown away went he said it was all playable if you ran uout of the demo they showed, because it would have been insane for Bungie to create such a wonderful engine.
Even people who were there during the presentation thought it would be playable space, and they talked about this in articles. Content isn't key sorry. Maybe you understood from the get go it would be not playable, and read though the lines, but most people didn't.
It would be dishonest to say Bungie didn't lie about all of this, as people were making expectation based on everything they said and they didn't correct anything to be sure people wouldn't expect too much.
But I don't think they lied on purpose. They were just really excited about their game, which is understandable, and talk a bit too much about the things they really wanted to bring to us.
Then you may have missed a lot of videos, or you may not remember everything:
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Jupiter & Taken King Vista from E3 Gameplay trailer
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Taken King Dreadnaught space in their second official vidoc, used as add
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House of Wolf social space in the PS4 official trailer
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House of Wolf content from the Destiny 1 reveal trailer
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Destiny 2 European Dead Zone in the reveal trailer of Destiny
Again, I don't think it's fair to blame Bungie about this, which could be considered as lies, but I think it's understandable that people and players would feel bad when they saw that content for vanilla Destiny showed in trailer to only be sell later, not matter the stories about the development of the game being bad, as DLC.