That’s not a typo. Destiny 2 already takes up around 87 GB on my hard drive with the Battle.net installation, and that’s with all the additional content that’s come out over the past two years. VGR reports that Bungie has sent out an email detailing the system requirements for when the game makes the jump to Steam and adds Shadowkeep, with a total requirement of 165 GB.
If you head over to the Destiny 2 Steam page, you’ll find that the baseline storage requirement is a bit higher than it is now at 105 GB. Most of that differential is likely accounted for by the content added with the free-to-play New Light edition of the game, and by Bungie’s estimates, Shadowkeep will slap an additional 60 GB onto that figure.