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Hollow Knight Silksong releases September 4th!
(www.youtube.com)
A community for fans of Team Cherry's hit indie Metroidvania game Hollow Knight
See also: Bloomberg interview with the team on why it took so long.
Seems like the TLDR is just they were working on it and didn't want to spoil anything. That's why they were radio silent. They also expected it to release way earlier but the game kept ballooning in scope.