As have mentioned before, Danny's upgrade videos are hype to generate youtube hits and are pseudoscience. Would not put much faith in any of it. He manipulates scaling to create his typical narrative of how bad the target speaker is and how it needs his upgrading. I could go on at length but let's just start with the initial failure to baseline against known measurements. For this speaker, JBL supplies much more data than most manufacturers AND states the conditions. Does Danny use it? No, and he flails around guessing at a measurement axis when it is stated in the specs....
"The reference measurement microphone position is located perpendicular to the center line of the mid and high frequency transducers, at the point 55 mm (2.2 in) below the center of the tweeter diaphragm"
After this wasted time, he does his usual misleading measurements and here is the initial result compared to JBL's...
View attachment 379160
Here I have plotted on a
standard 50 dB scale (rather than Danny's usual 25 dB scale). I have adjusted his plot to overlay the JBL supplied data. At this point. does Danny question measurement conditions or whether the speaker might be broken? No, it is just poorly designed and
needs his upgrade kit! So, rather than try some eq, let's rip out the drivers and design a whole new crossover! 

Even when the speaker measures well, he is often replacing parts for the sake of alleged "next level performance". Strange he provides measurements as a weapon but supplies none for some of his alleged improvements. He recently did another No-Rez promo video and there is not a single spec or measurement to illustrate its applicability or effectiveness.
Anyway, seems you already figured out the bottom line with regard to Danny. Hope you get to enjoy the long holiday weekend!