I think it's disingenuous to describe actively forcing people to speak and write language other than their preferred one as "a bit of an extra push".

Speaking more broadly, languages aren't persons and so they don't have rights; people do. Francophone Quebecois should have the right to live in a society in which knowledge of French alone doesn't put one at a significant immediate disadvantage, but I don't think there's a right to not be offended by use of other languages around them, or to force other people to switch their primary language.

In the context of the sign law, regulations on absolute legibility of French text would be sufficient to achieve the former goal, while the actual law that Quebec has is about the latter - that is the whole point of the "extra push". If anything, I would say that that is a good example of hardcore nationalism, actually, because it places the interests of the abstract generalized nation over the interests of concrete people who live there.