The whole benefit of the 5-60 is getting away from the standing start. An ICE has a unique advantage because even "without launch control/assistance" the engine is in a higher energy state than at 5mph. There is significant kinetic energy in the form of rotational inertia from all the rotating mass. This gives an ICE vehicle an advantage from 0 that it doesn't have when in gear and creeping along at 5mph.
The first point of the article, which may have not been obvious enough, is that the 5-60 rolling start test is more representative of how the average person normally drives. It thus better captures how responsive any given car feels during normal driving, or rather during any driving other than launching from a stoplight.
The second point of the article was that BEVs perform much better in the 5-60 test relative to the 0-60 test as compared to ICE vehicles. If you only use 0-60 when comparing BEVs to ICE then you are not comparing via the best metric if you want something that represents how responsive the vehicle feels during normal driving.
Why should Tesla use the 5-60? Because marketing! They are not worried about selling ICE vehicles. They want to sell BEVs and should get us all using better metrics, especially those that emphasize the benefits of electric vehicle performance.
Will they need to publish 0-60? No, but people are slow to change, hence they'll need to scratch that itch.