In my opinion, spot reduction is still a myth if you consider how spot reduction has been defined for years. The study as well as another article I found, are both pro-spot-reduction but I don't think it is in the same sense as what most people think.
When I think spot reduction, I think that if all I do is crunches then I'm going to burn fat in my mid-section only and not impact anything else. This definition is entirely untrue. It is impossible to promote fat loss in an isolated portion of the body.
If we change the definition of spot reduction to be an optimal diet with a core-focused high-intensity strength workout followed by high-intensity cardio to minimally increase the efficiency of fat burn in the mid-section then yes, I think it has some merit. You're burning fat across the whole body and possibly burning fat somewhat more efficiently at the targeted muscle site. Is this really spot reduction?
This study sums it up pretty nicely from my perspective:
And, so far as I’m concerned, that should be the death knell for the idea of spot reduction. Yes, there appears to be an effect whereby working a given muscle impacts local fat cell metabolism but the effect is completely and utterly irrelevant in quantitative terms. The amount of fat mobilized due to increased hormones or blood flow is simply insignificant to anything in the real world.
As an aside, the article you linked has some red flags:
Spot reduction is also reported after application of certain
pharmaceutical injections and ointments [1, 2], though you probably
don’t want to put much stock in any of the commerically available ‘fat
This is entirely untrue. The studies have participants use pharmaceutical grade weight loss creams in addition to a reduced-calorie diet. Having this statement in there really makes me dislike the article entirely.
In 2013, a novel study design was used to test the possibility of spot reduction. This time the study participants did high repetition leg presses with one leg without training the other leg. The trained leg did not lose more fat than the untrained leg.
Concretely, when you are exercising your left leg, more fat is burned off from your left thigh than your right thigh.
They have this quote in the article (you mentioned it yourself) however they previously mentioned a study where this was incorrect (i.e. they contradict themselves). The study where there is no difference is cited, the secondary statement is not cited.
I do agree with the following quote.
So if you’re a man that wants a slimmer midsection, heavy ab work may be counterproductive if the muscle growth thickens your obliques to a greater extent than you induce spot reduction of the abdominal fat mass.
For women, heavy triceps work to spot reduce the upper arm fat may be similarly counterproductive if no arm muscle growth is desirable.
This is probably the biggest point working against this redefinition of spot reduction.