The Accessibility team are not GMs and have nothing to do with tickets. I am confused as to why you created a thread about them. They have never been people players could contact.
That team collects information about all Blizzard games and services to help formulate strategies to make all games and services more accessible to a wide variety of users.
This can include toggles in games for visual aspects, close captioning, voice to text, etc.
It is very rare that a GM needs to enter a game to resolve an issue anymore. If they do need to talk to you, they will contact you. They do have Live Chat and Phone Callback for some of the Billing and Account access issues. This has been the case for many years now.
Even when they had the phone number, it was supposed to be for Billing and Account access - but people called in for everything under the sun and the line was always busy with 2 hour hold times once you got in queue.
If you want to learn more about how the GM contacts work, what they can help with, and what they can’t - read this
If you need further information. the Customer Support forum serves as an Information Desk. You can learn more about how to navigate the Support system, get info on policies, etc.
During working hours there tend to be Forum Support Agents around to provide information, as well as regular players. They are NOT GMs though, there are there to provide guidance.