Recently, I came to read this news
https://protos.com/spanish-police-rescue-crypto-investor-kidnapped-on-holiday/The first thing that came to my mind after reading this was that one should not talk about his crypto investments with strangers or friends as it can pose various risks. If you are active on forums like bitcointalk and involved in trades, you should not give information which can help others relate to your identity.
The image I saw in the Op's link was very painful because now that Bitcoin is not legal in our country it has to operate with a lot of secrecy. Otherwise, we are in danger because Bitcoin is a completely confidential matter, so you can't discuss Bitcoin with someone who doesn't know about Bitcoin or whom you don't trust. You may get into trouble. When you trade in Bitcoin you must keep it completely confidential and if Bitcoin was legal in our country we wouldn't be facing this problem.
I think you don't understand the point of the message posted by the OP because the situation was not about Bitcoin not being a legal tender in the country was the reason why you should keep your BTC holding secret if even BTC is legal tender in your country you still need to keep your holding secret so you won't be the target of the physical attack which exactly what happened the person used by the OP as a case study.