When eventually washed off, the aerogel is handily broken down by soil microbes.
I am not going to claim to be an expert on any of this BUT that wording sounds suspiciously like bullshit. Maybe it’s not, but it’s one of those phrases that sounds like when vitamin companies claim that more B12 has shown to fix whatever ails you. Or “our plastic is environmentally friendly: 100% recyclable, and breaks down into teeny micro-particles over time, and gets absorbed by the sea life like ordinary sand…”
One revolution I have realized in baking is the recent trend to start talking about weight and not volume in recipes for certain dry ingredients like flour. Three cups of fluffy sifted flour is a lot less flour than three cups of densely packed flour. Same with brown sugar, or wondering if you need a “flat teaspoon” vs. a “heaping teaspoon” of something.