Board Thread:General Discussion/@comment-28678213-20160901071318/@comment-4795804-20160901151842

"Shoots vicious little missiles instead of darts. Hydra rockets have sharp tips that can pop black bloons."

- Hydra Rocket Pods description

It doesn't say it adds an ability to pop blacks, it just emphasizes the information it can pop blacks even if the rockets act like "bombs" i.e. explosive weapons.