That review is ... lacking. They don't A/B the speaker against others, nor do they measure it. They just give it a whirl and then declare it the best thing ever. The measurement image that you posted is actually pulled from the Yamaha brochure. Don't pull the trigger based on that review, it's a pretty low-effort review.
Again, you are setting yourself up for a suboptimal setup if you eschew any kind of bass management. Here is the thing: if you just get the Yamahas and a subwoofer, the only way you can integrate them is by setting the subwoofer's low-pass filter to whatever the lower limit of the Yamaha is. From
actual third-party measurements, it seems to be about 50Hz. That is a problem for a few reasons. First of all, it wastes a lot of the potential of the subwoofer. The subwoofer will be a lot more capable in the lower octave of the speaker's frequency band than the speaker is, way more capable. So you waste a lot of dynamic range by limiting the sub to such a low frequency. You can use a higher frequency on the sub's low pass filter, but if you overlap the bass of the speaker with that of the sub, you will have too much bass. If you try to create content with too much bass in the monitoring, the mix will end up sounding thin on other systems. You don't want to make music with weak bass, do ya?
You can use an outboard crossover.
Here is a very simple analog one.
Here is a more complex DSP-based crossover. The Yamaha's bass attenuation is basically nothing, it won't help you out in the slightest. You need an actual high-pass filter. The PreSonus has one built-in.