@Rob-Verhoeff, The offline maps probably don't contain seasonal closures indeed. But the closure of the Tunnel du Col de Tende looks like a permanent one (until declared open by the local government). I think not being able to route through it is explicitly because it is not routeable in the base mapdata. It is not a seasonal closure. It also shows a different line pattern then the Mont Blanc tunnel for example. Sometimes you also see roads on maps that are still being built and therefore not open yet. My guess is that such things are in the base mapdata, and not in the seasonal closures.
