No, Rowell and all the others nominated but who played less than 10 games are still eligible. I can't remember his name but there was a guy who was nominated a couple of years ago then nominated again because in between got injured and still hadn't played 10 games so was still eligible.
Just found the list. Some interesting inclusions- Duncan Kellaway(1993, 1994), our own Craig Callaghan(1995&1996), Michael Braun(1997&1998), Luke Power(1998&1999), Nathan Jones(2006&2007), Mark Lecras(2006&2007), Michael Hurley(2009&2010), Jordon Gysberts(2010&2011), Sam Blease(2011&2012), Orazio Fantasia(2015&2016) and Alex Witherden(2017&2018) You can only be nominated once in a season.
Haydn Young, Liam Henry and Matt Rowell are all still eligible next season.