The fact that you did not start leaking for 8 years negates the issue covered by the related bulletin(s). The vehicles covered by the bulletin would start leaking within less than 6 months of manufacture due to improper/insufficient Fujibond application to the timing cover and/or cam caps. I was working for Subaru from 2011 to 2019 and must have fixed at least 100 of them from 2012 to 2014.
Initially we were seeing them leak from valve covers/cam caps - primarily bank 1 (right side of engine) But after a couple thousand miles the front engine cover would begin to leak in the areas of left and right rocker cover/cam carrier/head on the bottom. Again this also was more common on right side.
I would say your issue would be normal aging/heat stress. Due to the operating range of that engine there is quite a lot of expansion/contraction. That was one of the reason Subaru used Fujibond instead of gaskets for many mating surfaces - knowing full well eventually that over time those joints would eventually fail due to that small movement. This was actually discussed in Subaru engine training classes following the introduction of FB engines.
You could try to get coverage, but if I recall that bulletin was only a covered repair up to expiration of the 3/36 warranty or factory extended (Gold Plus). I have seen Subaru split cost or cover a repair for a customer that complained enough. There was never a recall for oil leakage - only oil consumption in engines that did not leak oil but burned it.