That's weird because I'm pretty sure that my point is explicitly spelled out. But just in case, here it is again:
If your trust is based in municipal numbers or statements, you should be aware that municipal numbers and statements are not trustworthy because there's a lot of widespread decaying infrastructure (and coverup!) between where they test, what they make public, and where your water comes out of your faucet.
And if your trust is based on "Rah, rah, America!", you should know that 15% (!!) of water systems serving over 10k people have PFAS levels measured above what the EPA says is safe. (And if you don't think that 15% is a lot, holy smokes, that's nuts.)
So if you aren't testing your tap constantly then you have no idea what your water is like, no matter what the city says their water is like.
And if you are testing your taps constantly, it's less hassle and gives a better result to just filter your water instead.
The author says "I don't filter because I constantly test my taps and they're good each time." That's not the same at all as saying that filtering isn't a generally good idea, especially for anyone who isn't constantly testing their taps. The author ALSO says "a fuckton of you have more PFAS in your water than the EPA says is safe, just not me, lol". The author also chooses to ignore that their good water today may become bad tomorrow.