you got things the wrong way round
accumulation plan = buying strategy
DCA = fixed amount frequently(monthly)
accumulation plan(strategy) can be many options. you choose the plan for you
DCA is just one option. there are others
sir I didn't say everybody must use DCA as there buying strategy, I just used it to site example if put in place we help your accumulating journey many have used it and it work for them and they are still using it till today.