(sorry if i've put this in the wrong section, i'm new to editing wikias in general >.>)
I think she was saying on twitter (like maybe around last year) that she doesn't want to be referred to as 'terumo' anymore, especially in video comments, and requested that people just refer to her as yuujin-san etc. The reason she gave was that people who didn't watch her namahousous/follow her on twitter were getting confused by 'terumo' appearing in the video comments. Basically I think she didn't want to alienate those fans.
The first line in trivia still says that she prefers 'terumo' though, so I thought I'd point this out.
If source tweets are required I can find some~ It might take awhile tho lol