Unselecting "Show Offline" in the guild roster leaves OFFLINE MODE players show. OFFLINE MODE should count as Offline. This is so annoying, at least give us a way to filter them out like alts.
Offline mode is different than Offline. Offline mode is not really Offline because when you go to log in then it will tell you that there is a character on your account logged in and do you want to bump them. So technically they are still in the game. Whereas Offline means the character is not in the game at all.
No, it is not hair splitting because your account is still connected which is why you have to say "yes" to bumping them OFFLINE when you attempt to sign back into that account.
I don't think it is a logical stretch to say that OFFLINE MODE should count as being offline for filtering purposes. When I unselect "Show Offline" the information I'm looking for is who is online, not who has a character in the world due to technical quirks of how the bazaar is implemented.