Calm down. It's been that way since I even began. One of my first competitors claimed bleach was a cancer causing agent. Keep doing what you know is right and they will disappear like all before them.
Don’t let it bother you. They are talking about something altogether different then what we use. We don’t use TSP. and as for the SH, you have an updated bulletin from GAF. And that is what they recommend. So use that if any one questions you about using SH. If you know your business and the products you use are what is recommended, then you have nothing to worry about. I look at it this way. If some one has to bad mouth what I do and what I use, then they are the ones that are worried about my business doing better then theirs.
Im sure they are using sodium parcarbonate and a power washer with an aria cleaner attachment. You can’t get the stains off without using pressure. I have tried. Also doesn’t kill any of the root systems in moss and lichen. There is a video of them cleaning the roof if you look at the website.