It wasn't that subtle, to be honest, given the author even says "Stasi-like citizen surveillance" (and in general references Stasi multiple times throughout the article), clearly alluding to what you think he is alluding. But I agree with you, I believe even something not-so-subtle like this will be missed by the overwhelming majority.
Really well-written and well-sourced article. Glad to see someone managing to write something that is pleasant and fun to read, while, at the same time, cutting straight through all the bs with no debris of fluff to just pad up the article.
EDIT: found an even better/more illustrative quote in the article -
"The participants in Clubhouse have tried to block these tattletale reporters from eavesdropping on their private conversations precisely because they see themselves as Stasi agents whose function is to report people for expressing prohibited ideas even in private conservations"