The 22-year-old was used mainly as substitute cover for regular left-back Kevin Nicholson last season.
But Gulls boss Martin Ling insists Rowe-Turner's release was purely a positional decision - not one based on ability.
He told the club's official website: "The main reason he has been released is the position I see him playing is where we have more cover than where I would like him to play.
"He is a left-back who can also play left midfield and I need a more defensive left-back, who can perhaps play centre-half as well, which is one of the areas I am looking to improve over the summer.
"It's more to do with shape of squad than ability of player, so he's been unlucky, but has certainly shown enough to be an asset for a League Two club or a Conference club."