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[SirVer <SirVer@xxxxxx>]

tl;dr: yes, your assumption is correct.

longer:
local rv = plr:get_buildings{"well", "burners_house"}

returns a lua table of tables (see https://wl.widelands.org/docs/wl/autogen_wl_game/#wl.game.Player.get_buildings). It will therefore return { "well": { b1,b2}, "burners_house": { b1}} and so on.
the # operator means length in lua. so #rv.well == 2, #rv.burners_house == 1.

the dot operator is just synthetic sugar in Lua. Ie. rv["well"] is the same as rv.well 

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