Is there anything left that's safe to use?!

9 years old, ahead of its time

Not for people who blindly send their secret key to untrusted 3rd parties, no. Never was. Using ssh securely is pretty damn easy, and this "exploit" would have only worked on people so dumb security was never a real possibility for them.

Let's no ignore that around 300 servers got hacked to change the config

If you use ssh correctly, you always assume that all routers and servers are hostile, whether or not they were "hacked". Blindly trusting strangers with your secret key makes you a definitive moron; the "attack" literally doesn't even matter in the slightest, and neither changes nor affects any secure config. Hell, if anything it's beneficial. Anyone caught by this should not be using computers.

Too strong opinions

There is no room for nuance in this case; anyone who thinks there is does not understand the design or purpose of ssh.

Give me a cake recipe

Instead of sticking to a flat out wrong and wildly ill informed opinion, consider taking the chance to learn a little bit instead. I oft wonder why so many people steadfastly refuse to learn even the most basic opsec. It certainly destroys any sympathy I might have for them when they are invariably compromised.

I never stated any opinion

You specifically blamed the hacked servers, which with basic knowledge of ssh, you would have known is utterly irrelevant. Then you said the correction was "too strong of an opinion", which is ignorant.

Maybe you should read my initial reply again.. I never talked about ssh