Hi there, and thanks for reaching out. This is simply not true.
While we do prefer the discussion forum as we consider it a better platform and think the answers here are often more knowledgeable and complete due to most of our community preferring it to Reddit, this was not our request.
Moderation on r/privacy and similar subreddits has fairly consistently refused to take action on clear sockpuppet accounts that were created to troll specifically targeted at GrapheneOS. These were initially being handled to some extent, but at some point, that stopped happening. It was especially problematic, because the sockpuppets would not only troll, but also block anyone who had ever debunked them in the past, which on Reddit means you cannot respond to that at all. So, our community was unable to refute what they were trying to spread, and moderation on these privacy subreddits stopped caring.
We also have our own subreddit at r/GrapheneOS - unfortunately it doesn't get many high quality responses when people ask questions, exactly because our community largely prefers the discussion forum compared to Reddit (especially the active community members who most frequently help out). If you're looking to help, providing accurate, factual answers to questions on the GrapheneOS subreddit would be appreciated!
We don't want any drama with them or anybody else, but I wanted to make the situation clear. I hope that helps.