I think it is a more than fair criticism of many modern pianists of Baroque era music, but let's cut them some slack too: it is entirely valid to re-interpret existing music through a more modern lens (hence the 1000's of covers) and Bach himself saw absolutely no problem with re-interpreting other composers works.

Music is both finished product and raw material, a score is much more raw material than finished product. Finally, the original is still available, nothing got lost.