Not exactly.. More like the molasses suppliments what the plant dumps, then the micro-organisms feast on the whole shebang, and dump the results of various enzymatic conversions in the intercellular regions of the roots.. Some of this stuff may travel up the xylem directly, others may linger to convert something else that will travel upwards..
Essentially the molasses isn't for the plant itself, its for the bacteria/protozoa etc.. The plant may directly uptake some choice nutrients etc, but it won't deal with the carbs directly.. It benefits from the fact that the organisms took those carbs and the energy they had to offer, and produced essential building blocks that the plant has difficulty producing on its own..
When I used to do hydro I adopted to using a double resevoir system.. O
ne was typical DNF nutes, and the other was a natural nutrient concoction created by goldfish and nitrifying bacteria.. (Plus I never saw any reason to not add molasses since it was suggested on overgrow).. The table got 2 feedings from each per day..
Crops I did after adding the bacteria culture remained much more vibrant near the end of flowering.. They looked like they had weeks to go at first glance, but they were milky, and had a flavorful smoke even though they were only getting officially flushed in the DNF res.. The goldfish poop converted by the bacteria raised the ppm quite a bit.. I almost feel sorry for killing so many goldfish..
I only wish I'd put 2+2 together at the time, and had thought about using my fermentation addidtives.. One guy in the other thread mentioned he'd looked at his AN carb loading suppliments, and they were similar to brew store additives.. I haven't had a chance to look into that myself yet though..