Yes, the colour coverage rivals some of the higher end screens of today's laptop screens and the 89% aRGB is very high for a 120hz TN panel, let alone 144hz IPS (they are normally 65% aRGB and 92% sRGB). The only reason why MSI chose the horrendous IPS panel is because of pointless thin bezels and the bulls**t necessity to have IPS all the time, at all cost. That ChiMei 60hz TN panel that I've listed before has similar colour coverage to the 120Hz TN panel made by the same company.
In the GL63/73 laptops, the panels will be poorly calibrated out of the box (as stated by Bob as well), but with the right ICC profiles, the colours will be excellent.
If only a thin bezel version of the same panel was being produced today...
And the argument that an IPS panel produces better colours only is valid if you compare an IPS and a TN panel with around the same colour gamut. An IPS panel with only 61% sRGB coverage has this argument fall flat, if compared to a 100% sRGB TN panel.
So it's never simple as "IPS good, TN bad".