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The line that has the thermostat you are asking about goes to the turbocharger after joining up with another that goes to the reservoir. After they join, the line goes to the thermostat that controls the auxiliary water pump for the turbo. The portion that goes to the reservoir is the return line to the reservoir because you can see the water flowing when the pump runs. Therefore it seems to me that it is a return line so flow is to main water pump in that line. Moreover, the auxiliary pump thermostat should be downstream of the turbocharger. It would not make sense to measure the temperature of the coolant upstream of what is being cooled. Therefore it is a return line so the flow is to the main water pump in that line.
Hope this helps with the arrow. One would think the arrow should point to the pump.
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