12/12 from seed or clone?

I read in https://www.rollitup.org/indoor-growing/214213-force-flower-early.html that one could start growing from seed in a 12/12 light cycle and that the plants would flower when they were ready. In other words, the plants disregard the light cycle and flower when they hit a certain stage of maturity.

If this is true, could I just perpetually be throwing clones into my empty sites? Or would the clones begin flowering immediately because they are technically already mature.

I just want some more insight on this school of thought.

cheers

They would start showing pre-flowers within the first week or so of being on that schedule from clone...90% sure. I could be wrong.