The point that Dr Nielsen was making is that Print Design and Web Design are different.
Print design works, but very badly, on the Web.
Web Design often works, but very badly, in print. Hi there, Whoever said that you cannot use print graphics on the net is wrong. There is a more limited color palette for the net. However, it is very easy to take print graphics and compress them or ever so slightly change them to make them work on line. If one wishes to do the reverse, i.e. use graphics from a web site and covert them to print - that is very difficult because the the graphic essentially has to be redone.