Things you may not have noticed (spoilers ahoy!)

[Romulator]

2. there was never really any clear indication of more than 1 flesher. I kinda get the feeling that this line was first written in an earlier version of the game [...]

I haven't looked through any maps, but I do know there is a male and female variant of the flesher, so there are or were at least 2 Flesher enemies.