TitanMPro State:locked(unlockable)
That text was added with Android 15, if I remember correctly.
TitanMPro The picture in the general installation guide does not show “(unlockable)”
There are no pictures in the GrapheneOS install guides at all. It sounds like you are following a third-party and outdated install guide. Recommend following the official install guide, which is always kept up to date, and is accurate.