Nether visibility nor OpenSubDiv settings work with FlipFluids. Whatever settings are enabled for the fluid surface automatically get set back to their defaults on the next frame.
In view port mode, only the current frame will be rendered with the correct Octane properties settings. As soon as the play head is moved, the check boxes revert back to their defaults.
And if one initiates a direct render, no frames are rendered with the desired Octane properties - all settings are immediately set back to defaults.