The turbo shafts break because they seize at high speed due to lack of oil and the shaft shears off.
You have fundamental issues with understanding how all this works. That's fairly obvious from your questions. Oil stop leak is a VERY bad idea for any engine, especially those that have turbochargers with tiny oil passages that need to remain clear for proper turbo shaft lubrication. Stop leak will clog things - that's intentional - how else are you going to stop leaks? Well that probably destroyed the turbo and very likely you won't be able to get that crap out of the engine without a complete tear down and it's likely destined for the scrap heap. I would write it off and either find a complete engine or get a different (newer) car that you can actually buy parts for. The EA chassis, especially the EA82T, is a dead platform with very little parts available - no oil pumps, and things like seals, gaskets, and timing components are rapidly disappearing from warehouses and within the next 5 years will be entirely unobtainable.
NEVER use stop leak products on engine oil leaks. They don't work and they frequently cause long term engine damage and eventual failure. Unfortunately it is VERY likely you killed it off with that decision.
GD