Full Idea
It's definitely not sufficient to be a realist that one be a truthmaker theorist, since one can simply be anti-realist about the truthmakers.
Gist of Idea
Truthmaking doesn't require realism, because we can be anti-realist about truthmakers
Source
Ross P. Cameron (Truthmakers, Realism and Ontology [2008], 'Realism')
Book Reference
'Being: Developments in Contemporary Metaphysics', ed/tr. Le Poidevin,R [CUP 2008], p.116
A Reaction
It is not quite clear how unreal truth makers could actually MAKE propositions true, rather than just being correlated with them.