Wolf, that’s not what it means. It means that the reason they originally were m’saken (instituted) Kaddish Yasom was for children (and others who for whatever reason cannot daven as shaliach tzibbur).
It actually is a quote from the Rema. My previous quote of and link to the Rema were actually out of context, so I’ll requote and link bl”n when I get a chance. Sorry.