Ah, I see the issue now after looking at this post from your mastodon instance. I am not posting from Mastodon, but from a Lemmy instance (a federated Reddit-like platform using activitypub). The way Lemmy seems to federate link posts to mastodon users is by sharing the Lemmy post itself, which contains its own comment thread, not the YouTube link directly. That intermediate site you’re seeing is the Lemmy instance I’m on, slrpnk.net.
Ah, I see the issue now after looking at this post from your mastodon instance. I am not posting from Mastodon, but from a Lemmy instance (a federated Reddit-like platform using activitypub). The way Lemmy seems to federate link posts to mastodon users is by sharing the Lemmy post itself, which contains its own comment thread, not the YouTube link directly. That intermediate site you’re seeing is the Lemmy instance I’m on, slrpnk.net.