If once you break contact with the surface of the water (pushing the hair down and breaking water tension) and the hair sinks then yes your hair is porous. I don't think it's a big deal though. My hair floated but recently has been sinking (however I did get a relaxer fairly recently) so I imagine it just needs to be pampered some more.
I guess that's why they call it a journey, lol, there is no one-stop or level of perfection. So long as you're still alive your hair will need maintenance.