This is a fake mod. Premium reward is a scam. What it does is it reduces your original reward by half so that at the end of the match you get double of that reward as "premium" in disguise. Due to that you will also never be in the top 3 of the match because it's ranked based on credit reward from destroying enemy's plane. This mod also prevent you from having the actual "premium" feature which is given away some time since it fakes the premium feature.
Unlimited rocket is working but in this game you will most likely never face a situation where your rocket ammo reaches 0 so it's useless.
Overall this is a bad and useless mod. I decided to delete it and install original version.