Ah yes. Laura Mize was mortified when she found that mumsnet SN board had an "edited" version of her podcast because we simply found her comments too frightening and they made us angry! She came on here and apologised, have you seen the thread? She built up a practice with a different clientele to the mumsnet SN board and that impacted her tone. On a technical level Laura's list of stages was the best thing I found that sticks to language so I'm grateful for them.
For me, though, Laura's stages were more useful once I'd got more used to tuning in (and re-tuning in) to what was "really going on" with my emotions, with the DSs' world, with what they could-do-but-others-denied-it and with what they couldn't-do-but-I-wanted-to-tell-myself-they-could. This was, is and should be a work in progress because we are mothers and we are parenting, not doing experiments. I found this board very helpful for that, particularly some of the posters with profoundly disabled children (jimjamshaslefttheyurt), and particularly the shorter writings and online publications of Stanley Greenspan and his "floortime" approach. So improving the quality of my observations, acknowledging but not attempting to eliminate all the subjective emotions that I had, that my family had, the various agendas that those around me had, the "need" that professionals had to make us fit the box-that-happened-to-be-in-favour-that-year.
Where does your Camerata point take you? Is it that you have some doubts about the best approach?
Hanen will help you "clear the ground" of less effective strategies that you may be employing and for me is its great gift. It greatly increases the chances that you will then identify and push at stuff that needs pushing but without disrupting your relationship/pleasure in him.
To answer your direct question, my older son at 18 months literally didn't grasp that words aren't just music, that they do work. So repeating them helped.