Although anonymous, some people seem to have their first names, birth years, etc. as part of their usernames (the profile also contains other information such as location, tinnitus since, etc.)...a lot of people have also provided the dates and times of their appointments.We are already anonymous on here
So, Neuromod may easily put two and two together and figure out the person based on this information.
Since this thread is public and no username is required to view, I am sure Neuromod is checking this thread frequently and it won't be difficult to figure out who is who. Since people don't have their hands on the device yet (although accepted), they may be fearful that Neuromod might find some reason to exclude them.
A bit too cautious I think, but some people might have this fear for whatever reason.
They may also be fearful that they accidentally say something that puts them under the exclusion criteria.