if the octagonal nut is out, the strut should slide out. if it's stuck in there, i can think of two things:
one, the rubber gasket on the bottom of the octagonal nut came off and is binding between the insert and housing when you try to pull the insert out. i had this happen once. look carefully with a flashlight and pull it out with a small screwdriver if that's the case. two, a previous owner dumped the oil out of there and the insert is now rusted to the housing. let's hope that's not the case.
two, if a PO dumped the oil out before replacing the inserts, maybe this allowed corrosion to form between the housing and the insert. if that's the case, try spray penetrating oil down in there and tap all around the housing with a hammer. don't hit too hard though, you don't want to deform anything.
the bright side of this is that i can now think of a really good reason to keep the oil in the housing!
how is the condition of your sway bar ends and the tubes that slide over them? i've had some in great shape, others turned to dust. often the tube is so badly rusted it has actually fused to the end of the bar. only way to get it off was gently grind it off. eventually it came off in flakes. see this post.
https://tercel4wd.com/forums/viewtopic.php?f=7&t=7481&p=79257