Micheal Denton explains it in Nature's Destiny on page 289.
If it is true that a vast amount of DNA in higher organisms is in fact junk, then this would indeed pose a very serous challenge to the idea of directed evolution or any teleological model of evolution. Junk DNA and directed evolution are in the end incompatible concepts. Only if the junk DNA contained information specifying for future evolutionary events, when it would not in a strict sense be junk in any case, could the finding be reconciled with a teleological model of evolution. Indeed, if it were true that the genomes of higher organisms contained vast quantities of junk, then the whole argument of this book would collapse. On any teleological model of evolution, most, perhaps all, the DNA in the genomes of higher organisms should have some functions.Sorry Michael, it is true. The genomes of many complex multicellular organisms have vast quantities of DNA that serves no purpose. It's junk. The whole argument of your book just collapsed, as did any argument for intelligent design.
The fact of junk DNA disproves intelligent design and discredits strict Darwinism as well. The IDiots lose twice. Their strawman version of evolutionary biology is wrong and so is design by God.