That is a really surprising thing after seeing tidex driving so much volume anyways. However the coins list which you have provided is not that much surprising as they are not even top 100 coins.
Would have been better if you would have provided with the reasons as to why they are delisted. I'm guessing they are being delisted for not having even little volume to their project.
Mostly that's the prime reason for such mass delisting. As it could not be worthy to manitnain over an exchanger.