If they have news content, regardless of where the organization is based, they are a “digital news intermediary”. As a digital news intermediary they are thus subject to the law and may be made to pay Canadian news organizations. Note that the law doesn’t make them pay for foreign news, but the presence of foreign news is enough to allow the CRTC to make them pay for Canadian news.

Michael Geist explains it here: https://www.michaelgeist.ca/2023/08/why-is-meta-blocking-all-news-links-because-bill-c-18-covers-all-news-outlets/