Answering myself, a bit, since reading the linked article provided this gem:
If a user agrees to having their map data viewable on their mobile device, then the map that the Roomba creates during a cleaning job is sent to the cloud where it is processed and simplified to produce a user-friendly map that ultimately appears in the iRobot HOME App.
And:
Where does data like photos or images taken from the camera get stored? Is it ever stored outside the home? If so, how is imagery data being used? Is it just being parsed and sent back to the robot, or is it being used to populate a larger database?
The Roomba 900 Series vacuuming robots capture mapping and navigation information via vSLAM, which stays on the robot.
“Stays on the robot” is only slightly open to interpretation - could actually mean it is stored on the robot (which is unlikely, actually, since this would be quite an amount of days after some time).
This still doesn’t explain why I thought the mapping would be airgapped from the remote control via irobot’s server. Plus, it’s not a direct quote from the CEO, but from an anonymous spokesperson in an e-mail interview.
For a company that successful and that large, this is quite lame a reaction. (Doesn’t compare to dieselgate, on the other hand… 
)
