Looks like there may be a mix - perhaps it depends on the input used ?
From page 2 of the link, third paragraph.
"
The PA Series employs the latest 10-bit (or 8-bit + FRC) grayscale control and
processing electronics, which, when aligned with the wide colour gamut RGB
colour filters, allows over a billion individual colours to be displayed. This 10-bit
colour capability is best taken advantage of when using the latest DisplayPort
video connector, and 14-bit LUT to ensure smooth and graded colour and
grayscale spectral distributions.
Experience the very best in colour image quality with the latest generation of state
of the art 10-bit AH-IPS technology, with exceptionally wide viewing angle, widest
colour gamut available (108.6% AdobeRGB colour space) and absence of colour
shift. The true benefit of a wide colour gamut displays is particularly visible when
combined with a 10-bit panel, since potential colour banding or visible grayscale
steps are eliminated.
"