specific applications instead of alternatives, yes, many apps do not work that are designed for an alternate OS.
In your case, have you tried GIMPShop?
But note the article is asking what cannot be done in Linux! Looking at programs that have not been created yet does not mean that it cannot be done now does it?
Linux can be made to do a number of things that it was not originally designed for. For that matter, so can Windows, OSx, etc.. However, since anyone can code Linux and alter it, it can be made to do things not intended Without a large corporation controlling every aspect of it and charging massively for it. In Linux, a hobbyist that knows how to code well can make it do many things that were not part of the original intent.
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