Absolutely. In this case, CLA isn't an issue. But I bring it up, because it seems to me that this article is a consequence of the prevalence of CLA's in projects advised by professional legal advice.
This issue of "how can we ensure this code is under copyright terms XYZ" seems to have been popularly solved by CLA's. And thus a pall has been cast over the traditional open source dynamic, where there'd normally be no question that a fork with a license in the repo is obviously licensed under the same terms.
I've heard this on legal podcasts as well. Where lawyers spend like 30+ minutes talking about whether a license in the project root counts. To the traditional free software / open source movement, this seems really silly, because that's how software projects worked for almost the entire existence of free software / open source software until the last 5-ish years.