What does “no” mean? The state of the law on consent in sexual assault and the mistaken belief in communicated consent

What is the state of the law when an accused argues they mistakenly believed the complainant in a sexual assault case was consenting to the sexual activity? This question has been addressed many times by the Supreme Court of Canada in the last three years, and the Quebec Court of Appeal has provided a relevant summary in Ofter v. R., 2022 QCCA 439.