That's what they say, but they can never back it up. When asked to measure specified complexity in DNA sequences, they fail to do so. It is simply a claim with nothing to support it.
Are we talking about evolution or abiogenesis? You really need to pick one.
If that is the definition that you are using, then evolution most certainly increases information.
"How do genetic systems gain information by evolutionary processes? Answering this question precisely requires a robust, quantitative measure of information. Fortunately, 50 years ago Claude Shannon defined information as a decrease in the uncertainty of a receiver. For molecular systems, uncertainty is closely related to entropy and hence has clear connections to the Second Law of Thermodynamics. These aspects of information theory have allowed the development of a straightforward and practical method of measuring information in genetic control systems. Here this method is used to observe information gain in the binding sites for an artificial ‘protein’ in a computer simulation of evolution. The simulation begins with zero information and, as in naturally occurring genetic systems, the information measured in the fully evolved binding sites is close to that needed to locate the sites in the genome. The transition is rapid, demonstrating that information gain can occur by punctuated equilibrium."
http://nar.oxfordjournals.org/content/28/14/2794.long
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