Earlier quoted context omitted.
There's no way they can ban him for saying that yet still claim to enforce the rules equally for all political affiliations. It's not the government, they absolutely can ban people for anything they want and they don't have to be consistent about it. There's nothing you can do about this it than deleting your account, complaining about them on the internet, and/or acquiring a seat on their board of directors and effe…
Sure Twitter and other tech platforms are well within their rights to act in an explicitly partisan manner, but their reputations will suffer and the government will be even more keen on breaking them up and putting them on a tight regulatory leash.
Maybe they'll burn their computers in protest like so many Nike shoes.