Orchids do not like cold water,cold water make a shock for orchids roots. I would say that it is pretty bad advice. It might work okay with regular houseplants, but not orchids.One thing I can agree, that water from ice cubes is much better than regular one. So for this reason you may water your orchids with ice cubes,but fill 70 % of a tall mug with ice cubes,put it in the microwave till the ice cubes melted. Take it out and fill the mug with the remaining icecubes until the temperature is about 30 / 35 C. And
then water your orchid. In this case your orchid will get high quality water!!