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I visited the MusΓ©e d'Orsay in October of this year. It's a large museum with three floors of public exhibits wrapping around a central atrium. It's not the "Impressionist Gallery" it's the "Impressionist Galleries" (plural). It consists of several rooms on one side of the fifth floor. These are closed off, but a selection of the most famous impressionist pieces are are temporarily on exhibit on the other side of the fifth floor.
The other floors are mostly unaffected. My wife and I spent essentially all day there and certainly didn't see everything, despite the closure. If all you want to see is CΓ©zanne, you might be disappointed, but if you are interested in Van Gough, Gaughin, Rodin, Lautrec, or anybody but the impressionists, there is plenty to see.
Upvote:2
It means that the collection of Impressionist artworks normally on display in the gallery will not be accessible during the period stated. http://www.musee-orsay.fr/en/events/renovation-of-rooms.html There is a list of the works in the collection here https://en.wikipedia.org/wiki/Mus%C3%A9e_d%27Orsay