I could see 50s inland perhaps if its W to WNW flow. You'll notice anywhere near the coast (especially south coast) dewpoints are much higher with SW flow off the water.
The irony is that he’s telling us about all this cool air over the northeast and that map shows exactly the opposite. I don’t think anyone was disputing a weak cool front over the planes.
That EPS pattern is not one to get a cane up here. Ridge is too far east over the plains and you need a deeper trough a little bit further west than where the mean is showing it right now. Probably better for florida or the southeast.