If you want to see a bunch of other cases besides the one you referenced, you can take a look at some of those I keep track of here:
https://public.tableau.com/app/profile/ddmrddmr/viz/BitcointalkMeritDashboard/De-ranked

Amongst the above cases (I don’t track them all, just those that have earned at least 1 Merit at some point) there’s this case that managed to go all the way back down to having 0 Activity whilst bearing 519 Merits (500 airdropped + 19 earned). He was a Hero at some point, as evidenced here.