I don't know why you want to buy the aforementioned coins; although I'm not familiar with that, to be honest, you have a better chance of getting a good return on your investment if you choose among the top altcoins to hold in the future.
Then, if a crypto is delisted from an exchange, that means there is a problem with the coins because they may no longer meet the quota or requirements of the exchange. That's as simple as that to understand.
I totally agree with you, I also have not come across the token the op mentioned, so it's hard to tell if its worth investing in or not, but all the same, like you have said, it's always better to invest in already well established projects where the risk is minimal just like investing in bitcoin.
But then, there are still people who love to take high risk with some unknown projects, this is definitely one of the ways to make really big money in crypto, but the risk is always high, if op is that type of person who don't mind the risk associated with investing in unknown projects, then that's his cup of tea and all we can do is wish him good luck.
I personally also sometimes take risk with unknown projects, but I always make sure to hold a greater amount on well especially projects where (like I said before) the risk of losing is minimal.