No biologist or biochemist argues we understand all the mechanisms of nature.
Clearly we don’t.
However, we need not look to intelligent design for the explanation of these puzzles, but rather await the stepwise progress of human technology and knowledge.
He seems to be summarizing how biologists train themselves to be blind based on myths about Progress and so on. Apparently biologists are indoctrinated, step by step, with imaginary notions of natural progress. They “need not look” or try to be aware of intelligence when simply imagining things about the mechanical tick and tock typical to technology, attributing their imaginings to the Blind Watchmaker is so much easier.
Ironically “stepwise” progress will never come if biologists sit around waiting for their Mommy Nature to make the type of selections that they imagine come naturally to her. Given their indoctrination it seems that generally they’ll never admit to the quantifiable impact of sight on things like intelligent selection and the progress typical to technology. Indoctrination is not education, although those subject to it will fail to understand that. Sight is not blindness, although those who are blind may be confused on that point. Recognizing and seeing ID as a possible falsification of naturalism is only a science/knowledge stopper to those who want to act as if knowledge drawn mainly from their own imaginations is on a par with harder forms of science like physics which need not be propped up by or linked with philosophic naturalism.
Note that as knowledge tends towards progress “stepwise” based on the use of technology which tends to progress in such a way what is being found is that philosophic naturalism is less and less tenable the more that can be observed. Yet somehow progress towards something other a philosophy of naturalism is apparently interpreted as being based on “gaps” in knowledge, as many biologists want to fill all gaps with their own imaginations instead of admitting that the work of a mind can have effects which can be known as such. They seem to close their mind of the synaptic gaps as a supposed matter of principle and then imagine that opening it again will be the end of all progress towards knowledge as we know it. Every biologist that I’ve ever debated has been quite the fearful fellow as a result of the notion of Progress that seems to come naturally to them, yet putting aside all the fear and reading between their lines it still seems that they have a little mind left even if it is trying to crawl back into the womb of their Mother Nature, step by imaginary step.
But surely the burden of proof lies with the challenger?
It seems to me that the burden of proof lies with those who claim that their theory is like the theory of gravity, claim that there is overwhelming evidence behind what they say, argue that the State must support their position and only their position, dictate that all parents must use their education dollars to teach their position and only their position, etc.
Also note that if someone is allowed to cite their own imagination as if it is evidence or proof then the burden of proof is itself imaginary. If ID types keep trying to specify a falsifiable definition and specification for Darwinism instead of joining Darwinists in blurring essential specifications then technology will naturally be on their side. Ironically, it will most likely keep evolving, step by step, to lift the burden for them with respect to revealing a number of highly essential specifications in the origin of the Cosmos, to the origin of life and perhaps even to the origin of specifications observed in many “species.”
 This was a reference to quantum mechanics. If you got it, then you're a bit of a geek. If you keep up with the debate there's a few layers of meaning here and there and probably some bad grammar as well.