The analysis misses a point. Wordle uses two lists of five letter words: words that are in the dictionary, and can be used in a guess; and those that can be used as the daily secret word. The latter list is smaller, and sticks to more common words. Wordle has been around for 1550 days, so they have used 67% of the possible words. In another couple of years, they have to either start using uncommon words, or recycle. There's no rush, so it's unclear why this is happening now.