Definitely don't look like CAEs to me, which are the biggest trouble makers out of the group...
But flying foxes are different than SAE's though, and it's rather annoying that the seller has listed both "flying fox" and "Crossocheilus siamensis." I'd say the pics in the link look more like a Crossocheilus species than the former.
As I mentioned way, way back in this thread I purchased what was originally IDed as "flying foxes" and they were a bit crazy (not aggressive, but boisterous) and not too keen for BBA...liked snagging any prepared food I added. I never got a good ID on them though and eventually returned to the LFS as they weren't what I wanted...but in any case, I wouldn't necessarily count on them being a quick fix for BBA, especially if they aren't true SAEs, but should not cause problems like CAEs can.