Jerry Falwell labeled Calvinism as heresy. It is very strange that Liberty University would have certain heretic speak. And, theologically speaking, if Beck is a Mormon, he is a heretic.
I'm not doubting your word but could you give me a reference to that?
Nuances are important when a person uses the terms heresy or heretic. It's an emotionally-ladden term which is often misunderstood.
Any theological error is a heresy and anyone who holds to that position is a heretic. However, it is possible the error does not affect the person's salvation. Most evangelicals would consider Calvinism to be this type of heresy: Christians but with a flawed heresy. Any Presbyterian who holds church office has affirmed Calvinistic positions. I doubt that Falwell believed that Presbyterians weren't Christians.
There is another class of error (sometimes called a damnable heresy) which is so egregious that a Christian cannot hold that position and still be a Christian. Mormonism is of this nature. There might be some Christians in the LDS "Church" but it is despite the teaching of that "church" not because of it.