maybe, I don't know. I think normally you had to reflash back to stock before taking the 13599 update or it would give a specific error. it's possible the same update was applied, maybe before lt 3.0 was released, like around the day of that dash kernel's release. I guess that's possible.
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I think with xebuild and jrunner, there was a patch to circumvent the drive from being flashed officially. it may be on by default, because I don't remember having to return to stock flashing my main jtag, but I think you had to if using official dash kernel. afaik, the only truly important file is the one that says su in the name of an official update. it's the only one patched for jtag/rgh afaik, and it's around 12MBs last time I checked.
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I only know that because I've manually updated my jtag before using command line. I have a
tutorial on it, but it's obsolete now. you have to know a lot about your system. it's easy as hell to flash a new nand build now, almost idiot proof, as all info is read by the nand dump itself.