I see little harm in anything that encourages additional caution in my kid. Nothing will keep him from going outside, but if some of the descriptions prompt him to be more cognizant of things like thinking about when to walk alone, when it’s a bad idea to be using a mobile phone, considering when to deal with additional hassle or expense in exchange for avoiding risk, then that would be a good outcome for him.
As he spends more time in the area, sees how things work, reads the security alert emails and talks with others about their experiences he will develop his own ideas of where and what behaviors are safe and which require more caution. Until then, having one more data point (the opinion of one person about safety of various zones) is a helpful part of the mix.