As they ignore everything which discomforts them. And when they can't ignore some things, they nevertheless refuse to connect the dots. So let the thread die. It doesn't make any difference. Evolution is so well-established that it doesn't matter what they think. Or say. Or do.
What claims? The only relevant claim being made is that the hollow tube has been sequenced. No other claim about that information has been made. The statement about the sea squirt's emulation of Christopher Reeve is a previously held opinion.
On the other hand, how do you fit this into the vertebrate/invertebrate split?
The squirt can also do things that we can't. It stiffens its adult body with cellulose, for example. Plants and bacteria use this tough molecule in their cell walls, and possess similar genes for making and breaking it.
Where are the lilies with the nerve cells?