GrapheneOS is still not vulnerable to Cellebrite device exploitation as of the February 2025 support matrix which have leaked online in multiple places.
Google Pixel devices with GrapheneOS are the only devices explicitly mentioned by Cellebrite as unaffected by their exploits. They are also the only third-party operating system mentioned in their documentation.
More at A deep dive into Cellebrite: Android support as of February 2025 - Osservatorio Nessuno | archive