It's like any other PoS coin, there is no max supply because of the staking interest; inflation is never unlimited, it depends on the amount of staking rewards; it can negigible, it can be a lot; we have currently 20% PoS reward (that's not the inflation itself which is a lot lower) with the new consensus protocol it will change to 1% p.a., we're in public testnet, roadmap is on our website stealth.org for details, as well as the whitepaper
Perhaps you do not know that not all POS coins used unlimited system.
But thank you for your answer.