He very specifically talking about the current Israeli presence though.
Whether what he's saying about the legality is factual is a completely separate question from whether he tells people it's okay to kill Hila.
He IMO throws in Hila merely as a snipe against her husband, not to imply that she is still a valid target.
We talk a lot about the Hasan method, but really he functions by a much simpler algorithm.
1) Start out with a pretty basic statement ("Palestinians are allowed to resist occupation from a foreign power").
2) Throw in some random buzzwords and snarl words, injokes, and intensifiers ("illegal occupying force" "act of resistance" "your favorite podcaster's wife") without regard for the implications or even producing a coherent, non-contradictory sentence.
This is why everything he says is about 3 times wordier than it needs to be and why it can all be interpreted in so many ways (and also why he's so bad at engaging with other people in discussions, because he just wants a chance to say a talking point that may or may not even have anything to do with what the other person said). Do I think he started speaking with the intention of putting a fatwa on Hila Klein? No, I don't think he starts any sentence with a clear intention in his own mind, he just kind of wings it. But he did end up saying something that could very reasonably be interpreted as a justification for killing Hila. You could also reasonably interpret it as a justification for Hamas refusing to give up power in order to end the so-called genocide, but he also inserted a snide comment about Hila. The issue isn't that what he said could only be interpreted as an endorsement of harassment or violence, it's that it reasonably could be by his deranged fanbase.
Not to make Hasan sound cooler or more clever than he is, but it's like a mob boss telling his underlings that "a message needs to be sent" to the business owner who won't pay protection money. Obviously you
could read that as, "clearly explain to Mr Santello what could happen if he doesn't fork over $500 a week" or you could read that as, "beat him up, but don't send him to the hospital yet." Mob bosses intentionally take advantage of that plausible deniability in order to provide a shield for themselves, just like Hasan. If Hasan really, truly didn't want anyone to interpret it as a call to attack or at least harass Hila he could have corrected it. This isn't some 200 year old legal document or golden plates buried by God, he could have easily just said, "obviously I don't think that ex-IDF members are valid military targets, I was only saying that currently serving members are." But he won't ever make that "clarification" because he doesn't believe it and you shouldn't assume that he does just because he theoretically
could have made it.