You're getting tripped up by the terminology. This chart uses "liberal" in its classical sense, which refers to a philosophy that values individual liberty and limited government. Obviously this term doesn't apply to modern so-called liberals. It does, however, apply to liberians.
The term used on the chart for modern so-called liberals (who vote Democrat and post on DU) is "democratic socialists" -- a much more accurate and descriptive term for them.
lol -- liberians
Make that libertarians!