We have no way of knowing whether they genuinely support Trump, or whether they did actually support Hillary like they claimed to. It's all election smearing and rhetoric, which voters don't care about, as the election results have shown.
They claimed to have donated $20,000 to Hillary. The website claimed the claim is false.
We will never know, but more importantly, the voters didn't really care who the KKK was supporting, as the election results have shown.