That is correct. The unthreaded "spacer" on the m2 screws is a bigger circumference than the drilled hole in the dampening mount. Basically the screw heads do not sit flush.
Called DJI - apparently the "black" screws are to be used when connecting the vibration dampener to the gimbal.. (not the M2. 5*5). I never even used the M2. 5*5 screws
Mounting the vibration plate to the gimbal used the black M2. 5*6.3.
Mounting the vibration plate to the P2 used the M3*5.
Mounting the GoPro strap used the M2. 5*6.3 as well (since the M2. 5*5 head was too big).