Reality: it's specifically your job to understand these things on behalf of your clients(especially since the Lacey act is number two most important law related to your career).
Did you not even the third sentence? "To make matters worse, the Honduran law governing such shipments was not valid at the time of Huang's arrest---a fact that the Honduran government pointed out to the 11th Circuit Court of Appeals. Nonetheless, the federal court found Huang guilty in March 2003 and imposed a two-year prison sentence." Huang's conviction of violating the "laws" (regulations, really) of Honduras was upheld, despite the fact that the Honduran court found that those laws were not valid at the time they were committed.
Beyond that, the very thesis of the site is that there are too many laws for anyone to understand. And your rebuttal is that they should have known anyways? The Lacey Act makes it illegal "to import, export, transport, sell, receive, acquire, or purchase in interstate or foreign commerce--- any fish or wildlife taken, possessed, transported, or sold in violation of any law or regulation of any State or in violation of any foreign law" (emphasis added). And "law" has been interpreted to include all regulations, not just "laws" passed by legislatures.
Do you know every single law and regulation related to fishing in every country? There's no master list that you can look up, and there is physically no way to know that no laws were broken unless you were physically present at every step of the process. Oh, and in this example, it doesn't really matter if the laws were repealed or overturned, either.