Coin got delisted because there was an issue with someone manipulating an early wallet to get more stakes than he should have gotten. That bug got fixed and the team tried to do some action against this guy who got coins he was not entitled to get. Cryptopia got contacted by him and decided to delist the coin. That is all what happened. This guy still had his coins and he was probably the one dumping, so once he has offloaded all his coins the coin will go up. It's an opportunity to get in cheap. The project is going fine as planned on the contrary the team did a really great job to got the coin going again. The problems that occurred were actually all related to that person who got those coins that he was not entitled to, like a rushed implementation of fundamental nodes and wallets losing the right chain. All this was fixed and the wallets and blockchain are working like a charm for many weeks now. If you want to invest do it. Could it be a scam? Of course it might be a scam, bitcoin might be too. Actually this Satoshi Yakamoto holds most coins and paid nothing for them. So he basically scammed everyone. Look at the tech and the roadmap, see if it might make you money and if yes invest what you can afford to lose. Same rules for investing in bitcoin and other cryptos. Yes you have a higher risk here, but you might just get a bigger reward.

Edit:
A little addition: team has contacted coinmarketcap to correct the messed up statistics. DO NOT rely on those numbers for now, only trust the price on coinexchange. This is for 1B3. The supply and coinexplorer work with kB3 as unit, ie 1000 B3. Supply is 620 million kB3, not B3!!!