Wow, I was told by the conservation officer that if it isn't specifically listed as a legal weapon, then it would be illegal to hunt with. Like, air rifles are listed under legal weapons for small game, but air pistols or air shotguns would be illegal. But then again, they don't mention "in-line" muzzleloaders either, they say that's lumped in with "percussion cap" and is legal (even if it used electronic ignition)... I'm fairly new to this state but the regs seem very confusing. Seems to be up to the officer whether or not a weapon is legal or illegal.
Glad it worked out for you though! That's the first atlatl success story I've heard on whitetails.