@MumenRyder I’ve observed much the same as others have noted too. If a strain has too much indica genes one can end up with a 6" bud. I have that currently with a Big Bud plant that I started on 12/12.
If you find the right mix of Sativa/Indica, or a relatively quick Sativa the method can work well like in the article you posted. I ran some Goji OG, and it did really well on 12/12.
If you have a pure equatorial sativa, that lives in 12/12 normally, the reduced light cycle will not do much to slow them down. Although, I do think they will stay a little smaller than if you veg them for 6 weeks. I had a Snowhigh Panama Black I ran on 12/12 from seed that went 26 weeks!
Right now I am actually doing a 12/12 run. I selected a couple haze crosses, a few from Snowhigh, and a few more early flowering Africans. I’m hoping they turn out more like the ones in the posted article, and I have high hopes for the selected seeds!
Here are a few examples of plants that were run on 12/12 from seed.
Panama - Canabiogen
Blueberry - DJ
NL x BB. This is what you hope you don’t find!
Panama Black. This is the other end of the spectrum. This plant went 26 weeks on 12/12!