revegging autoflowers

So I'm a newbie to growing and in the middle of my third grow which unfortunately has had a tough time. Around the 3 week mark we had a power failure and I didn't notice that the digital timer reverted to an old time schedule. The plants where on 20/4 and then dropped to 18/6, as said I hadn't...

On Facebook recently, a grower claimed that he's been re-vegging his autoflowers and that it can be done with all autos. The alleged trick is to keep the light on 24/0 and switch back to veg nutes. This sparked a TREMENDOUS amount of replies, with a very small percentage saying "oh yeah...