[baol]

Not an expert on AWS, but as this seems something that you may need to share and that cannot be easily changed, considering it a secret is just snake oil.

[jalk]

As the author writes: it's not a secret, anymore than your house adresse is, but it allows a burglar to recon and plan an attack

[remus]

> ...considering it a secret is just snake oil.

I'd think of it as more a defence in depth measure. It's not a secret, but taking some common sense steps to not spray it all over the place could slow down an attacker, and a lot of the time just making yourself a slightly harder target than the next guy is enough that an attacker will go in search of softer targets.