Okex want to delist Utrust? Why? And where you find this information?

I see that UTK have low trading volume at all exchanges (only 35k per day) and very low at Okex. But this is because price very low now and people want not sell UTK. They are holding and waiting platform

Wasn't it delisted already? I haven't checked, but delisting was scheduled to happen at 12:00 Aug 17, 2018. You can view the official announcement of OKEX at :
OKEx Implementation of Token Delisting and Hiding. You can view possible reasons here :
OKEx Token Delisting / Hiding Guideline. Most likely low volume is one of the reasons for UTK.
No, UTK still trading on Okex:
https://www.okex.com/market?product=utk_btcthere are also ETH and USD pairs... but no volume there...
May be they changed their plans about delisting UTK? In anyway this is promising project ...
And coinmarketcap showing UTK/BTC pair and volume at Okex.
Their
announcement was pretty confusing because UTK belongs both to the list of tokens to be hidden and delisted.
However, after checking, it seems to me that UTK/BTC and UTK/ETH trading pairs have been really delisted. As you can see, even if you can view it using the link you gave
(which is not the trading link[1]), there are no Ask and Bid orders already. Also, both pairs will not show on the trading page even if you enter the ticker in the search field
(if the token is just hidden it will show when you enter the ticker).
You're right that Coinmarketcap is still showing the pairs, but they are not being updated since August 17
(the date of delisting).
Anyway, there are still other exchanges where UTK is still on and UTK on OKEX has a low volume.
[1] UTK trading links are
(but it will not show anymore):
https://www.okex.com/spot/trade#product=utk_btc https://www.okex.com/spot/trade#product=utk_eth