you furnished blow-by-blow directions on how to do this in your link.
is this a matter of solus doesn't have these packages?
or is this where you are getting hung up?
"Arch Linux: /etc/pam.d/system-auth with pam_pwquality, or per service.
CentOS 7: Using /etc/pam.d/system-auth (symlink) and /etc/pam.d/password-auth (symink) with pam_pwquality
Fedora: /etc/pam.d/system-auth-ac with related lines starting with “password”
Gentoo: /etc/pam.d/system-auth using pam_cracklib
RHEL 6: /etc/pam.d/passwd using pam_cracklib
RHEL 7: /etc/pam.d/passwd using pam_pwquality
Ubuntu: /etc/pam.d/common-password using pam_pwquality with the minlen setting"
which was is the solus way?