Is "Actes de JADT" same as JADT conference? Where to download Actes de JADT publications?
From here I would understand "Actes de JADT" to mean the proceedings of the JADT conference. Typically, a conference and its proceedings go hand-in-hand. Someone might informally state that they have had a paper accepted or published in "Conference X", but a formal citation would later point to "Proceedings of Conference X" or similar (the title can vary). While I have no direct prior knowledge of JADT, I'd expect it to be the same case here.

Now, clicking through the google scholar link to the actual document, it appears to be a thesis (or project report as you state in the comments), not a published article. However, there's this paper from Actes de JADT 2010 by different authors, but with a quite similar title. I think that other works may have miscited one of these, or that Google Scholar might have misinterpreted some citations. Anyway, given that your title is not listed in the Actes de JADT 2010 Table of Contents, I think you can safely assume it wasn't somehow published there.