I don’t think some of these things are strange at all. A few are good advice.
The Austrians in particular are pretty casual about non-sexual, incidental nudity, and I had to give my Austrian visitors some of the same tips that this link considers strange. I learned this after I had visitors from Austria who changed into their bathing suits in a public park in Texas. They did not try to go swimming naked, nor did they walk around naked, they simply took off all their clothing and put on their bathing suits in full public view. This was meaningless to them, but rather more meaningful to the nearby Texans.
There are nude beaches along the Danube. I never considered that a big deal when I lived in Vienna, and got used to seeing the naked bodies from the road, but I never got used to seeing the naked bodies ON the road. The bathers would wear their street clothing for the drive to and from the beach, park on the streets, take off their clothes while next to their cars, then lock all their clothing and valuables in their autos. This meant they were naked on the side of the street, then naked on the walk to and from the car. I always found it weird to see naked people just wandering on public streets.
And they have no prohibition against taking a pee against a tree in a wooded, public area.
Everything I described is reasonable in any sensible world, which shows you why those “strange” warnings are necessary when Austrians (and others) expect the USA to be part of the common-sense universe.
Needing to tell tourists not to stalk someone is pretty weird.
That one is weird for sure, but there may be a translation issue there. Are there countries where stalking people is what the cool kids do?
Being able to lock your clothing in your car makes so much more sense at a nude beach. Taking a full backpack, or just hoping that your stuff doesn’t get grabbed if you go for a walk, sucks.
Okay, what’s the point of a line when you can join wherever?
Depending on where you go in the United States, that warning about bad-tasting water is true. I grew up in NYC and have lived there most of my life. I have read on multiple occasions that NYC had won a poll for the best-tasting tap water in the U.S. I have spent time in VA and CA and the water tasted fine to me, but the water in MN was really gross. I was told it was because they had “hard” water. Perhaps a water filter would help, or I might get used to the taste if I spent enough time there. However, I was only there for three days, taking depositions. Then, my boss, our client, and I spent half a day at the Mall of America while we waited for our flight. They had a really cool NASCAR simulator there. Other than that, I bought a Governor Jesse the Body Ventura t-shirt and had lunch at the food court. Nice people, some interesting places to visit, but really gross tap water is my review of Minnesota.
I seem to remember many years ago, there was a posting showing a huge crowd waiting outside a grocery store before opening on a weekend morning in Austria. The writeup was along the lines of that this wasn’t anything special, usual crowds, and tongue-in-cheek mentioned that there wasn’t a word for “convenience” in German. My son is interested in seeing it, but I can’t find the picture anywhere in the archives or on the Internet. Would you happen to still have it?