The wording on that table can be confusing; "Bootloader locked?" Yes/No is referring to the ability of Iodé installer and ROM to have that device bootloader re-locked after installation.

I can garantee you pretty much all of them come with a locked bootloader from the factory/shop (even if they have a "no" on that page), and it needs to be unlocked to install a different rom from the stock one. Doesn't matter what flavor of Android it is. It might be that IodéOS installer is doing the re-locking immediately after and so you'd think it wasn't ever unlocked, but it was.