Garcinol has been extracted from the rind of the fruit. It is a fat soluble molecule. So, is there any chance of finding in the butter extracted from the seeds? I couldn't find any supporting papers.
Garcinol is one of the major active components found in kokum, a spice extracted from the fruit of the Garcinia indica tree.
Kokum butter is obtained from the fruit of the kokum tree (botanical name: Garcinia indica), which grows in the western parts of India . The fruits are spherical with diameters of 2.5–5.0 cm . They are a reddish-purple in color and contain between 3 and 8 large black seeds containing 32–40% fat. Like illipe butter and sal fat, it is one of the base oils that are permitted for use as “vegetable fats” within the scope of the EU Chocolate Directive