No, it won't work to unlock maps using gimgunlock in some new devices and unfortunately 2xx9 series [including your 2599] are affected as confirmed in catymag's post you quoted. See also the post which is linked by catymag in Post #2 above, i.e. this info:
It unlocks NT (not NTU) IMGs in some 2014 devices, but not working with all new devices 2xx9 and probably in most of newer devices firmware
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