Villain may easily expect hero to float flop with wide array of hands. A double barell should fold out gutters oesds medium pp etc. Once we call turn our range consists of tons o f flushes, slow plays and some medium pp.
It's unlikely villain will bluff that river given our range strength and the narrowness and capped nature of his value range.
And to those saying villain can have TT for example. That's entirely too thin and most sane aka good villains aren't vbetting TT. That's more of a bluff and I'm an advocate of some sashimi thin vbetting.