Its way more likely he's not fit.
People are so odd with this player - its constantly like last season didn't happen
At this point, does it really matter?
I like Naby, I think fit and in-form he's an excellent midfielder. It's true he's missed a lot of games through injury. It's also probably true we sometimes don't play him when he is available because we are trying to manage his fitness. There have also been periods where he's been fit for longer periods of time and he's missed games because Klopp won't use him, for reasons unbeknownst to us (but interpreted as a lack of trust from the manager). Trying to categorise his missed games between those three scenarios is a bit of a waste of time though, because the end-result is the same - he doesn't get on the pitch often enough for us. The root cause is irrelevant unless he magically becomes more robust or Klopp wakes up and decides actually he is a key player.
In a vacuum I think his ability warrants keeping him around but we're already carrying about 3 or 4 too many unreliable midfielders. And to be honest, lots of assumptions that Naby will stay if offered a new contract. If I'm him, I'd probably be looking elsewhere. It's clear the physical demand on him in this team/league is too great for his body, and he's never managed to establish himself in what has at times been a pretty underwhelming (to be kind) midfield. I reckon he'd probably fancy himself the first midfielder on the team sheet at a CL level team in a slower league - he certainly has the ability.