Chapter 7 of LScD is about simplicity, but he does not express there the views that Li and Vitanyi attribute to him. Perhaps he said such things elsewhere, but in LScD he presents his view of simplicity as degree of falsifiability. The main difference I see between Popper and Li-Vitanyi is that Popper did not have the background to look for a mathematical formulation of his ideas.
Chapter 7 of LScD is about simplicity, but he does not express there the views that Li and Vitanyi attribute to him. Perhaps he said such things elsewhere, but in LScD he presents his view of simplicity as degree of falsifiability. The main difference I see between Popper and Li-Vitanyi is that Popper did not have the background to look for a mathematical formulation of his ideas.