IBM Plex Serif described as sans-serif

[scriptor-pro]

I think the code on this page

https://docs.xz.style/fonts/ibm-plex/ibm-plex-serif#usage

that reads font-family: 'IBM Plex Serif', sans-serif;

should be font-family: 'IBM Plex Serif', serif;

could not find it in my fork hence this issue