Yeah, you are allowed to drive as fast as you like on some Autobahns, but if you have an accident and your speed is deemed to be faster than safe, the insurance companies are like "nah bro, you brought this on yourself"

Never heard of this, but you are likely to be deemed at fault due to reckless driving above certain speeds.

If something happens with you faster than 130km/h on the autobahn you're not automatically covered by insurance. You won't lose insurance, you're just only fully insured when you stay under 130. Above you make unnecessary risks and the insurance company won't cover that, if speeding is the cause of the accident.

I asked chatgpt and it is a bit different than what I thought. It came with this answer:

You are not automatically uninsured if you drive faster than 130 km/h. However:

If you're involved in an accident while exceeding 130 km/h, you may be held partially liable (Mitverschulden) — even if the accident was mostly the other party’s fault.

This can reduce your insurance payout.

Your insurer might reduce compensation if speeding is found to have contributed to the severity of the accident, even indirectly.