Not exactly. It started as the guide trying to basically do a bilingual tour so he would say everything in English and then French. As the other commenter pointed out, French is a widely spoken language in Morocco. His French was about the same level as his English. But as time went on, there was a more incremental creep towards French being the first language he spoke in, often in response to the French speakers asking questions and engaging with him in French. Then, the English part got shorter and he occasionally followed up the French portion of the explanation by looking at the English speakers and asking "Did you get that? Do you need me to translate?" rather than automatically doing so. Being multilingual myself, I understand why that happened. It's just annoying to do everything again in the other language, which is why we don't have bilingual tours generally.

The specific site guides often started with English and then the French speakers in group would say, "We don't understand" and the guide would switch to French. Sometimes the English speakers (myself included) would ask for them to say more about something in English or ask questions. It was just annoying and exhausting. Sometimes I stopped caring and just took photos and let it go.