I'm not seeing Loctite on that screw. That's red Nylok, same as what you find that comes pre-applied to mil-spec stock screws. It's not the same as a thread locker.
Something had to have been wrong with the parts (or perhaps the factory assembly monkey cross threaded the screw) for the screw to have seized up before threading all the way in. Also, sometimes those Nylok patches can be applied so thick, or so close to the start of the threads on the screw that it can be difficult to know if it is being threaded in right to start. And it could have been that the build up of Nylok was just so thick that it bound up going in and seized up the screw, but the stuff doesn't cure in a way (like a thread locker) to glue the parts together. It's just supposed to be an interference fit to prevent the part from vibrating loose.
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