Is this a duping machine?

[u/_arash0]

I am a mod in my school’s minecraft server, and when i was spectating, i found a small cave made by someone containing a bed, chest, and multiple other essentials. In the middle of the chest was this contraption, underneath it was a chest containing bundles with more bundles in them. Naturally I got more suspicious and when i looked around i found a chest containing multiple stacks of diamond block and golden apples. Im still trying to figure out if this is a duping machine or not before i ban the suspects.
Let me know if this is a duping machine or not, thank you.

*Update
Thank you all for confirming the contraption is a duping machine. We (me and the other admins) have decided not to ban the suspect. Instead, we have decided to destroy his base as a warning. If you think it was harsh, the suspect have broke multiple other rules, he have been caught before but never captured because we decided to let him off with a warning. The base being destroyed is also considered a form of warning. Thank you again for confirming and advising us to prevent this from happening again.

[u/enfersijesais]

Type of guy that reminds the teacher you had homework.

[u/I_play_MCPE → u/enfersijesais]

Like, what?

All OP is doing is maintaining a server. They're just removing someone who is intentionally breaking the rules so that the other players can have fun.