Deleting multiplayer from the Unreal engine can save memory

That was my immediate thought on reading the article. Is this in dev or prod builds and which UE version is it referring to?

(Not that I expect the UActor code to have changed much but modifying UActor seemed more common in the early 4.x days.)

Oh, good point. The test was done in the current stable 5.5 release in a development configuration :) Since this is a change to the memory layout of the class, there should be no change due to the build configuration, though.