You didn’t understand the comment and ran with it. Success in ODIs can suggest potential for Test cricket, but it’s not guaranteed. Specifically, ODI bowlers with control, reverse swing/movement, and discipline often adapt well, though Tests demand more stamina and patience. Shaheen’s 4-5 meter lengths (similar to Abbas’s), reverse swing, height and movement both ways would have made him more effective than Naseem, Khurram Shahzad or Jamal in South Africa (as they all bowl hard lengths 6-8 meters). While managing his workload is vital, Shaheen’s skillset suggests he’d have been a real asset in SA Tests. You have no clue if you think otherwise. Even when he was 18, he averaged 26 in SA test series when he had less skills and similar pace, just because of the bounce he got.
I never mentioned white ball cricket regarding Kohli and Rohit anywhere in my comments above. However , test form cannot be confused with ODI form. The comment was about test cricket, which is the most challenging format. It’s rare to find a test player who will last 100 tests, and they cannot be wasted.