There's no news that "isn't true" in this case, which is why it's not FUD. China announces that all crypto transactions are illegal, but some crypto enthusiast tweets China loves bitcoin and it's not banned. Somehow, I think the actual government has better information on what is banned and what is illegal than someone who has a vested interest in crypto not being banned. I don't know what the opposite of FUD is, but if what you say about Justin Sun is true, then he's clearly spreading it by posting things that are demonstrably not true about crypto in China.
I checked his (Justin Sun's) Twitter account and all he said is ”
not to be too pessimistic.” How you want to interpret this is up to you. He is claiming that there is no ban on "cryptocurrency possession". I am not sure about this. When they are saying that all the cryptocurrency transactions are illegal, my understanding is that it includes the storage of cryptocurrency as well. The writing on the wall is clear. The regime is quite determined this time and they want to wipe out the usage of cryptocurrency in mainland China (probably also from Hong Kong, if they are able to do that).