These don't make any sense. According to TWU hyper g soft 16L is one of the softest polys that hold tension relatively well on the market. According to twu it has 172 stiffness. I am having hard time to believe that all tier one strings have lower stiffness than hyper g soft. I wonder if usrsa changed their stiffness measurement technique along the way some time.
www.tennisindustrymag.com
The link above shows isospeed cream 16L as 243 stiffness rating (it is around 178 for 17 in twu). Isospeed cream is an elastomer copoly. It is very hard to believe that almost all tier ones at similar gauge are softer than cream.
For example here it says Luxilon 4G 130 has 269 stiffness rating (from 2018). There is no way, it is softer than hyper g soft 16L!