No, it's still not an issue. Check out the table for 256 bit numbers in the article you linked. To get a 0.1% probability of even a single collision, you need t

No, it's still not an issue. Check out the table for 256 bit numbers in the article you linked. To get a 0.1% probability of even a single collision, you need to generate 1.5e37 hashes. At 10 TH/s, that would take 3e17 years. 10 million times longer than the age of the universe.