I want to add to debunk this myth.
Once I had to pour my mash, from one mash tun into another since the tubing got clogged when I was trying to vorlauf.
I litterally POURED 7 gallons of 154 degree water from one cooler into another. Tons of froth and bubbles.... went through with the brewing process (extremely worried the beer was ruined) and there were NO signs of HSA.
It may have been fine since whatever got trapped may have been boiled off, but supposedly the oxygen binds with the sugars in HSA so boiling would not fix it, yet, no problems at all.
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