[gempir]

The line does make sense.

select(2, ...)

Means it returns all arguments after 2 (including 2) so only "ns" in your example.

Unpack then turns the table of core into 3 variables into F,G,V

local F, G, V = unpack(select(2, ...))

So it's basicly the same as your example but ignores the name of the addon.