The important quote from the article you linked is: "But what happens when we throw some unsafe code at the issue?", so the claim that safe Rust doesn't have UB (that isn't considered a bug in the compiler) still stands. If you mix in unsafe code, bad things may happen, regardless of whether you wrote the unsafe yourself or rely on a library.
> the claim that safe Rust doesn't have UB (that isn't considered a bug in the compiler) still stands
Yes!
> If you mix in unsafe code, bad things may happen
Yes!
My point was only that those bad things may also happen after the unsafe block that is their root cause. This is in reply to parent's "all of these [UBs] are inside of unsafe blocks". They aren't. They are caused by something inside unsafe blocks, but they may also materialize after.
