Groww inteducing demat holding of mf

Source: https://groww.in/blog/mutual-fund-investments-groww-demat-account I got few doubts/query if I don't opt out for this feature! Hope someone clarify! 1. Does existing investment (sip and one time both) will also convertef to demat form or will be on the soa? 2. If I start new investing in any fund that will start as dematerlized form. Am I right?