Earlier quoted context omitted.
That's an overly negative and hyperbolic view. Nothing is entirely wrong here, but you're painting every single point in the most negative way possible. You can certainly argue about how good the healthcare system is in the end, but it isn't categorically inaccessible. And if you pay 400 EUR/month you're earning enough money and can choose the private health system if you prefer that. The credit ranking also works in…
While choosing to be in the private system is an option, it only "makes sense" if you make at least 70k€ a year, so definitly not for everyone. The issue is not getting in - but getting back out before you retire and don't have enough available income to pay the rates anymore.
The cost for public healthcare is scaled by income, and is limited around 400 EUR. It's a bit higher now, but I would suspect that the OP is not necessarily talking about the most current values here and is hitting the older limit and therefore earning more than the "Beitragsbemessungsgrenze".