I take it he hasn’t heard about “hiding things in the open”.

That would be, for example, using a constant of some near year in “end time” column meaning unfinished action.

Or just making some part that will inevitably have to be changed - “write-only”, as in unreadable. Or making documentation of what he did bad enough in some necessary places that people would have to ask him.

So many variants, and such obvious stupidity.