[EditorBrowsable] on SyncList and implications on build size

Hey,

I saw that the SyncList type is decorated with the EditorBrowsable attribute:
View attachment 142574

I wonder if that has any implications with regard to code build size or for code stripping.
This type comes from the System.dll and not mscorlib. Does that mean this additional DLL must be added to the build? (or maybe it's already added anyway?)