Point number 2 is how WC states they make their retail WTA liquids. This is how I wish all WTA was sold, considering nicotine on its own is not what we're paying extra for; what we are paying extra for is the minor alkaloids aspect of WTA (not to mention the time/resources involved in extracting WTA).
The takeaway point here is that, yes, WholeCig uses only WTA for all their products. Aroma uses a mixture of nicotine and WTA for their flavored products, which is a pretty extensive product line. These flavored Aroma products are still quite effective as you appear to have noted, and it helps to keep the price down for these flavored products.
Again, when one purchases the Aroma 24 mg unflavored WTA (which is Aroma's "flagship" product), there is absolutely no nicotine added. Every bit of the 24 mg/mL is extracted and purified from tobacco.
I would also add that a recent set of process improvements (within the past month or so) has resulted in Aroma's 24 mg unflavored WTA having essentially identical light color, lack of off-traits, throat-taste, and effectiveness at satisfying the urge to light up as the WTA that I make in small non-commercial batches. This represents the realization of a goal that Aroma and I set back in July of last year. Aroma's former WTA was good, but it wasn't as good as mine, and "not as good as mine" wasn't good enough for Jerry or me.
"New and improved" is more than often just so much marketing BS, but this isn't the case here. If I were to vape Aroma's current generation of WTA (referred to as "VS" WTA, meaning "very special" WTA) and my custom WTA in a blind side-by-side test, I would have a hell of a time discerning the difference between the two.
Tossing around marketing superlatives really isn't my thing (I'm a chemist, not a slick marketing guy with a different tie for every day of the week), and until recently, I wouldn't say the things about Aroma's 24 mg unflavored WTA that I'm saying about it now. Sure, I'm pulling for Aroma's success, but my praise, at whatever level I give it, isn't given away, it's got to be earned. I'm not about to say something that I don't believe is true because I prefer not to have to keep track of lies or half-truths. Life's much easier when you don't have to worry about keeping your stories straight.
Aroma's earned it.