I personally don’t find it funny because these types of jokes essentially boil down to “I used a concept outside of its context, and for that reason alone it is funny”. However, with a lot of these jokes the context is so narrow (i.e. programming) that they are almost universally not understood by wider audiences.
Conflating two concepts can be funny (e.g. puns) but this isn’t that. “Dereferencing a movie ” has no meaning outside of manual memory management.
I understand humour is subjective but some jokes aren’t as strong as others (and some jokes aren’t jokes at all).