"Security through obscurity" refers to the concept of hiding the mechanisms that provide the security rather than key security. If everyone can find out how the lock works, weaknesses in the mechanism become exposed. If knowing how the lock works does not make discerning a specific key usefully easier, the lock is that much stronger.

Now, using secrecy laws to try to obscure the innards of crypto gear does arguably fall under that term.

Securing passwords (keys) does not constitute "security through obscurity". Deliberately opting to stay with an old, less well known system because less people are familiar with cracking it does constitute "security through obscurity". I hope you see the difference.

yours,
Michael