I'm curious about the science behind this, all my experience points in a different direction.
I'm always trying to push the limits and get my plants outside as early as possible (late april/early may). In years past I've had several plants start to flower early as a result of change in light cycle.... every time they begin to stretch and show some early signs of preflower for the first 2-3 weeks .... then I typically see a complete slow down for 2-3 weeks while it reveg's... but I've never found that the reveg plants grow any bigger than the others... i've actually experienced the opposite result, the reveg plants never get as big as the others, and most of the time show very strange growth patterns. It always seems that any growth gained from getting them out early is lost to the time it takes to reveg.
Before putting them outside I gradually reduce the light cycle indoors from 18 hrs down to about 14-15 hrs to match what they'll be going into.... and that's certainly helped, most of them don't begin to flower ... this year I plan to add some supplemental light in the greenhouse to extend the days until about May 21st when the sunset lines up.
... but I've never heard of intentionally cycling them into flower, and then outside... just curious