Your perv. , friend did you no service with that.

Old wive's tale.
It has no effect on Chloramine
Boiling will remove Chlorine gas, but it also drives out the last trace of dissolved air.
I trust that you are stirring, shaking, air-stoning, or whatever, to replace that air.
Roots need to breathe.

Your plants look pretty darn good for all that.

Unless you are balls to the wall organic, the Cl./Chloramine additives are useful protection from anaerobic bacteria.

Aloha,
Weezard