Is this followed by the “Feast of the Assention”, when the Holy Spirit came to Mary and she assented?
Yes, although she just presumed Joseph would be down with it. (The Feast of the Presumption.)
The problem is that many like the author of this piece and other posters are now moving one step further and denying the incarnation completely. They see our worship of the 100% man and 100% God Jesus Christ as a joke.