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@Fixedwheelnut
Another good tip for removing them is use a 'heat gun' and then some of that freeze spray as used in Plumbing to freeze a water pipe.
Heat the seat tube & post with the heat gun then spray the seat post with the freeze spray, aluminium and steel expand/contract at different rates and it can help break the bond between the two.
seat post in a vice and use the frame for leverage helps to.
Once it is out use a good polymer based grease rather than lithium as that helps prevent the electrolysis that causes the problem.
I use 'Plastilube' a grease often used to stop car brake pads squeaking. never had one seize since.
Loctite version of Plastilube here