They may be thinking of the one approved even more recently [0], of which I am unaware of any controversy.
[0] https://www.theguardian.com/society/2023/may/03/new-alzheime...
[0] https://www.theguardian.com/society/2023/may/03/new-alzheime...
Though the one announced in 2021 made the headlines and appeared to be more of a success than it was. You could say a new drug being approved after 20 years is still a relative success (it does have some statistically significant results which led it to being approved).