This looks like Binance app on phone, right?
No, it's dex-trade web version.
I had a chat with the dex-trade team and they said it was a bug in their end and they have already fixed it although they didn’t share me any insights. Well, this should be a bug. Who would have hold such huge amount of ETH in their exchange account, on such a non reputed exchange even.
Centralized exchanges often use data to control prices.
Some large orders are made by them.
True but this is not the case here obviously.