The change was merged in Dec 2023 (see here). The Reddit Exodus was in summer 2023.

Worth noting is that what counts as an “active user” has changed between now and then. During the Reddit API exodus, an “active user” was a user who had posted or commented in the past month. Now, it includes users who have voted. If the 54k MAU record was set using the first algorithm, it is likely that the MAU using the new algorithm (which includes voting) would have been much higher.