What does this mean for all French overseas territories?
Legal everywhere that is integral to France (French Guiana, Guadelope, Martinique, Reunion, Mayotte). They're as much a part of France as Paris. Not sure on areas with more autonomy like New Caledonia, but I suspect it does not apply.
Article 22 of the law specifies that the law will apply (except a few random parts which are not that important) to New Caledonia, French Polynesia and Wallis-et-Futuna.
So it applies to all but Saint Pierre et Miquelon, Saint Martin, and Saint Barthelemy?