I only have my own experience to go on, but I always have a score of some kind with me for reading, during a down period at work, during breaks, in a waiting room at a car mechanic or a dentist and all that.
I don't see any way it can possibly hurt.
Added benefit: I like to try to work out solfège for things or intervals I can't quite immediately hear, and I can easily pencil in fingerings, or make reminders for rhythmically complex passages.
The only disadvantage, for me, is that I sometimes get tired of beyond so familiar with a piece by reading away from the keyboard that I'm not always inspired to follow through with actually playing a piece or a section at the keyboard. That's just laziness, though, or lack of energy,
For me it does help with memorizing, though, even if I can't always fully hear more complex harmonies or contrapuntal voices at once away from an instrument.
It's kind of like "muscle memory," but without actually using the muscles: just vividly imagining the way a piece should feel, especially after I've figured out the "secret code" for playing a piece or fragment.
Certainly "brain memory," though.
I take it you're not happy the answers you got in June from some child's forum in June of last year? I don't blame you. If you want good answers, you should come to a board oriented towards adults. So, I applaud your decision to come to an actual forum.
Topic: Sight reading question