That model is “real 5K”. It’s actually 5120 x 2880 pixels @ 218 PPI. It’s comparable to the 5K iMac and Studio Display. That’s a really good display.BenQ PD27305S. This is a 27" 5k monitor. It is not a cheap monitor considering that it costs around $1,200 USD, but color calibration and things like that aren't an issue, since BenQ provides the software and controls to calibrate it-if that is what one wants to do. However, the monitor is pre-calibrated to meet standard specifications for photographers, for example.
That’s not what OP is trying to defend as “real 5K”.