Earlier quoted context omitted.
Yup, 15m ("quinzaine mètres") tall. https://caniapiscau.ca/attraits/mur-ecran/
Interesting, I think the English version of that page was mistranslated as per https://web.archive.org/web/20060421035031/http://www.caniap... which seems like an old version of that same website. Fifteen and Fifty are easy to mix up.
[1] https://web.archive.org/web/20120904222048/http://www.caniap...
[2] redirected to https://web.archive.org/web/20130720073238/http://www.caniap...