There's a difference between overdrive and too MUCH overdrive.
A normal VA panel can NOT outperform a TN panel in RESPONSIVENESS overall, meaning the TN panel will ALWAYS Be faster.
However a VA panel can have perfect overdrive, except on some black scenes, if you set the overdrive to a proper level. But then you will have slow response.
The overdrive on the Benq is set to an atrocious value. That's why the Benq has 3.2ms of *TOTAL* input lag (ignoring vsync frame time), coming from adding Signal processing lag and pixel response time.
Look at the bottom of the lag chart.
But to achieve this, you pay the price in INVERSE GHOSTING.
This is how the xl2720z looks at 144hz at default, blur reduction is disabled.
If you were seeing black text on a grey background (not white) you would see the spectral color on the benq screen, that you saw in the video that looked bad.
Here is how the XL2720Z CAN LOOK (blur reduction is *DISABLED*)
Just requires two toggles to activate this which is actually a bug exploit. 144hz MBR=off
If this were used in that test, everyone would be saying "Benq benq benq".