This is a fun idea

1: Keister some fentanyl in, poison the food with fentanyl, set food outside hut.

Depending on the dosage it will either die or be very weak for a while.

2: refuse knife, demand shovel. Dig giant holes to trap it. Possibly fill holes with sharp sticks so it's impaled or at least fucks up a foot or two. Bonus points for digging smaller holes all around the Hut then piss it off and watch it break it's legs.

3: depending on how intelligent it really is, you could possibly get it to do it's self great bodily harm. I caught an angry squirrel in a cage once. The squirrel just headbutted the cage over, and over and over. By the time I'd gotten to it it'd already busted it's head open pretty horribly, like it hurt to watch. Didn't stop it though, just kept headbutting that cage in a.. rage? Not even "normal" headbutts, these were full body jumps from one side of the cage to the other. It was trying to use it's head as a battering ram I guess. So maybe provoke the rex and run to your indestructible hut. Maybe it knocks itself senseless trying to get to you. Personally I wouldn't bet my life on that but eh, you do you.

4: just.. traps. Summon your inner Hunter. "What would kill this thing and how to I make that happen? Deep hole strategy again, collect some vines, scale a tree, hoist down with the vines above the hole and now you're bait.

Idk

As was pointed out I guess I'd have to dig the holes close(r) to the indestructible hut.