The head appears to be sandwiched between two layers of metal.

Someone has bent the lid of the hdd, the other side you’re seeing is the reflection on the disc surface

The right hand side has a random piece that has shadows and depth that makes it look deeper than the disk depth on the left.

For me the shadows and reflections look consistently and reasonable. E.g. the reflection of the metal arc on the right hand side ought to appear thicker than the metal of the arc due to the perspective.

Also what is that foam cutout over the disk? I have never seen that on drives I have opened.

No idea what it’s for, but I’ve already seen that in an hdd I’ve opened.

Ps: the downvote is not from me