you may be right that the economic development of Kerala in the last 2-3 decades could be because of India's overall economic development. But note that Kerala is consistently in the lead to many indian states, including Gujarat, in terms of Human Development Index. Gujarat continues to lag on HDI despite being historically economically richer than Kerala:

- 2011: HDI in India rises by 21%: Kerala leads, Gujarat far behind - https://www.firstpost.com/india/hdi-in-india-rises-by-21-ker...

- 2011: Malnutrition mars Gujarat's growth story: HDI Report - https://timesofindia.indiatimes.com/city/ahmedabad/malnutrit...

- 2017: Gujarat lags behind developed states if HDI parameters are compared: P Chidambaram - https://www.financialexpress.com/india-news/gujarat-lags-beh...

- 2021: If Gujarat is a model, then the real toppers in development indicators, like Kerala and Tamil Nadu, must be supermodels - https://www.thehindu.com/opinion/op-ed/the-gujarat-middle/ar...

- 2021: HDI: How States Fare in Human Development - https://ceda.ashoka.edu.in/hdi-how-states-fare-in-human-deve...