There are two fundamentally different MOIs (moments of inertia) that are relevant to golf club construction:

Clubhead MOI – If you strike the toe, the impact force creates a torque around the head's CG(Center of Gravity).  A high-MOI head resists twisting, so the face orientation changes less.  That's the traditional forgiveness discussion you see in advertisements.

Club MOI – Here we're concerned with the mass of the whole club and its distribution relative to the grip end of the club.  Head weight and shaft length contribute to MOI significantly, but shaft weight and, to a lesser extent, grip weight also play a role.

It’s possible for a club to have:

• high head MOI but a relatively low club MOI, or

• low head MOI but a relatively high club MOI.

They are not interchangeable measurements.