That experiment was done in 2015, when the Swift runtime had to be included. If you build an app now, it will link to the system runtime and be close to 100kb as well.
This seems to be premature optimization. The author forced himself to learn archaic Objective C for a completely unnecessary reason, and now is stuck with that design choice despite not having any benefits.
This seems to be premature optimization. The author forced himself to learn archaic Objective C for a completely unnecessary reason, and now is stuck with that design choice despite not having any benefits.