It looks like that - I tested it and it does not prevent visual mode on the new editor. I can't find that magic word on the MediaWiki documentation, so I suspect it's a custom feature for the classic editor. However, you can ask Fandom staff for an authorized answer (https://fandom.zendesk.com/hc/en-us/requests/new ), and if you do - it will be nice of you if you share the answer here.
