3800 lines of code is an extremely small program. OO can help when you have a large business project, large team with people, some of whom are possibly not great coders.

Showing that one single person can write a small procedural program that's more structured, faster, etc. than the corresponding OO code written by someone else is not very relevant for real-world projects. I'm not saying OO is great everywhere, but devs in the industry have been writing working code on large scale using OO.