I've explained a half-dozen different ways why your observation of your own existence E, cannot discriminate between competing hypotheses H about how you came to exist.
They are not competing hypotheses about how he came to exist. But now I understand how you've gotten to your argument and why you were trying to insert E in the likelihoods earlier. Refer back to my earlier example about my parents having met:
H is "my parents have met"
~H is "my parents have not met"
P(H) = P(~H)
E is "I exist" <- this is
not where
Jabba's argument fails
P(E|H) > P(E|~H) <- this
is where his argument fails
Then (assuming I came to exist either through my parents having regular intercourse or my parents having used artificial insemination):
E n H = "I came to exist through my parents having regular intercourse"
E n ~H = "I came to exist through my parents having used artificial insemination"
The hypotheses about how I came to exist are E n H and E n ~H and not H or ~H. The latter are hypotheses about the universe in general (whether it is one where my parents have met or not) for which my existence is merely relevant.
Trivially P(E | E n H) = P(E | E n ~H) = 1, but that's neither relevant - it just says that the probability of an event conditioned on a subset is 1 - nor does "your own existence" have anything to do with it, since as you can see P(E | E n H) = P(E | E n ~H) for
any events E and H.
Likewise in Jabba's argument the hypotheses are not about how he came to exist, but about the universe in general (whether it is one where our selves are mortal or not). But in his case his existence is not even relevant to them, which is, again, where it fails. You can see this by Jabba arguing that the likelihood of his existence under H is "virtually zero" and not "exactly 1".