It’s not cemented into the chassis lol, Apple replaces it for $99 or you can just buy the part from ‘em and replace it yourself.
Yes the batteries are cemented into the chassis :D The last 3 times I tried to use the pull tabs they added they simply broke before the battery was out.
I mean, that sucks for you but pull-tabs are considered ‘repair-friendly’ by pretty much everyone in the Right to Repair movement.
I believe they might work for a bit of time, but with usage and eat they probably go bad and end up breaking. If you see on YouTube Rossman and others they’ve similar experiences.