Firefighter buttons are meant to only be used in very rare special occasions (emergencies) so "special" is just emphasis, whereas developer access is a completely normal way to use the product and thus "special" suggests additional significance. Sure not everyone uses the product as developers, but then not everyone uses the 18th floor button either.
Developer access isn’t normal to a lay audience. That’s my point. To a lay audience developers are special computer expert people who do completely different things than they do.
From the perspective of a non technical reader developer access isn’t normal, it’s special.
The HN audience doesn’t see that. But the phrase isn’t confusing to normal people.