Count me as thinking the author doesn’t know what he’s talking about. A lot of Trump signs around Iowa, Nebraska and South Dakota, including the Hillary behind bars graphic.
Personal knowledge of some situations indicates some traditional Republicans are not putting up signs this cycle out of fear, but are definitely voting Trump.
IF he has a friend without signs in a neighborhood where there used to be plenty, the locality has probably changed the sign laws.
Trump signs have been spotted in Brooklyn neighborhoods where Obama signs were common in the last two cycles
Monster Trump vote
The only think Hillary can do at this point is demoralize Trump supporters, and that is what she and the her media pals are doing, or try to do.
Ignore the polls, the BS and vote Trump!
Even without changing the laws, the locality might be the issue. One year I had 3 or 4 signs in front of our house. I looked out the window one day to see a municipal truck removing them all. He drove away before I could stop him. I called the municipality and was told that yard signs too close to the street would be removed due to visibility. They weren't any closer to the street than other people's signs for Dems, and I hadn't blocked anyone's view of our straight stretch of road. Our township is loaded with D's of course. I wasn't able to get the signs back. I was told that they'd been destroyed already. I didn't believe that story either.