in my opinion, the payment process has been updated and is different from the old way so that the payment menu using bitcoin does not exist, or it could be that Twitch has removed the bitcoin payment menu. I don't understand much about Twitch because I don't use it but I hope that payments on Twitch can use Bitcoin again so that there are more bitcoin users.
What do you mean the payment process has been updated? Beside credit cards the following payment options are currently available
Do you mean the crypto payments has been integrated with one of the other available payment options?
I also find it strange that you can't find any news or official announcement about this.