Apparently, that's how Biblical Hebrew expressed the jussive. German uses 3rd person subjunctive ("Meine Seele sterbe mit den Philistern"), Polish (and other Slavic languages, I imagine) also uses 3rd person future but with explicit "let" thrown in: "Niech umrze dusza moja z Filistynami".
But those are the older translations — those quotes are from Luther Bible (1534) and Gdansk Bible (1632); you can find newer translations that use the wording of "let me perish with the Philistines" variety as well.
I can't help but wonder about LLM translations... will they do it better or worse or just different? I can wonder if it might be with less bias, or with a better body to pull from, but I can see it can be slop too.
> That sounds like a person resigned to his death.
Well, yes, precisely. Just two verses earlier Samson prayed to God, asking to grant him a last bout of strength to take revenge at the Philistines for blinding him: "And Samson called unto the Lord, and said, O Lord God, remember me, I pray thee, and strengthen me, I pray thee, only this once, O God, that I may be at once avenged of the Philistines for my two eyes."