I think the news clearly mentioned the offer was for whom, i didnt see India or Keralites (to be specific), mentioned in it
I do not trust Indian news sources to provide real picture of any Pakistan related thing. So here is a Pakistani Source :
https://tribune.com.pk/story/2338728/pakistan-unveils-permanent-residency-scheme-for-foreigners
Apparently it is open to any foreign national but they are targeting Afghans and Sikhs. There is a sizeable Afghan population in and around Karachi so it is for those who want to buy properties for their relatives in and around Karachi or those Sikhs in Canada/US who want to visit religious sites in Pakistan all year round. Investment is very modest 100K or 300K.
From Pakistani side, its like a life long multiple entry visitor visa with a place to live.
Funny thing will happen if Indian side start treating this "investment visa/PR" similar to citizenship for its own OCI program. Currently, if you or your parents or grandparents hold or EVER held a pakistani or bangladeshi citizen then you will be disqualified for OCI. Will be interesting to see if Indian government extend this ban to investment based PR too for OCI... That will mean Sikhs will be lost as clients for Pakistan.
Pakistan and India, the eternal bickering brothers who never want to call each other brothers.