Hi there, this is an old post, but I have tried using the solution from here:
You guys replied: "Please confirm that you named the file _brand.php and you did put it in x-child/framework/legacy/cranium/headers/views/global directory. And please check in Appearance > Themes if your child theme is active.
If you can confirm that, and the site name/logo is still generating an H1. Please create your own thread and provide us the site URL and login credentials in a secure note (not here because the original poster can see it)."
And just to confirm, yes it is in that folder, and called _brand.php, I do not have a child theme, but I update this eveytime you update the theme.
This is to confirm the double H1: