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The guidance is reasonably clear, in both French and English. If the restrictions was based on citizenship, the website would state so, as it does in several other places.
It does however mention additional restrictions for British residents.
However, due to reciprocity:
If you are coming from the United Kingdom, no restrictions are in place but you will be asked to carry out a 14-day voluntary quarantine.
You should still be expempted of that based on another provision detailed further down:
Certain categories of persons, particularly those in transit to another country, will be exempt from the voluntary 14-day quarantine mechanism, unless they show symptoms:
Individuals in transit to another country;
It's a good idea to have a proof of your residence in the UK and of your ability to return there of course.