Not exactly. The way it works is that if it’s an event type 3, you shouldn’t use markdown and if it’s event type 30023 you can use markdown. The lengths of the two message types are the same.

Personally I would rather have a field on event type 3 that said formatting. But my understanding is that #[7]​ didn’t want markdown showing up in the primary tweet like messages so the support was relegated to a secondary event type.