This is true now that I checked into it. Kerala Madrasa Teachers Welfare Fund Bill was passed in 2019 according to this article.

https://www.google.com/amp/s/www.thehindu.com/news/cities/Thiruvananthapuram/welfare-fund-for-madrasa-teachers/article30023633.ece/amp/

However, this article says this

We spoke to Dr Moideen Kutty AB, Director of Directorate of Minority Welfare, who rubbished the claim being made in the viral message and said that the state government does not pay any amount to teachers working in madrasas.

We also reached out to the office of KT Jaleel, and they said, “The salaries of madrasa teachers are paid by the respective madrasa committees. They are paid according to the financial capacity of the madrasa committees.”

https://www.google.com/amp/s/www.thequint.com/amp/story/news/webqoof/viral-message-shows-incorrect-data-on-madrasas-in-kerala

Personally I don't think the govt. shouldn't be doing even this.