Ya I think its a Canada thing only - on the US GMC site, I can see its available to select as an option. On the Canadian GMC site - its no longer listed as an option.
Went into the dealership today to order a 2025 Hummer EV SUV.
Asked for the transparent Roof option and the Team said it looks like it's no longer available as an option for 2025.
I went online to check their configurator and it no longer shows there either.
2024 configurator still shows it...