Re-reading the article it's not when the nonce is reused, but when in the (r,s) of the signature the 'r' is reused. To end up with the same 'r' twice you must

Re-reading the article it's not when the nonce is reused, but when in the (r,s) of the signature the 'r' is reused. To end up with the same 'r' twice you must reuse the nonce but, I think, not only that. If you reuse the nonce but change any other parameter (for example putting slightly higher gas fee), then I'm pretty sure the 'r' changes (I'll go test that now out of curiosity).