Only if you consider Adorama doing it legally ripping people off. I can assure you that Adorama has already paid proper tariffs on all sales, and their increased sale price reflects their increased tariff costs. Originally, they were selling them at $4650. Now they are selling them for $5500.
Your current Japan order experience definitely provides a new data point after August 28th. However, one successful anecdote is no assurance that anyone else will have the same experience, even with the same seller. Not every package is X rayed or opened to verify the contents is what the seller claimed. Some just make through without any scrutiny. Drug dealers and smugglers count on it. Those that don't make it through and are seized are just collateral losses that are a business cost of smuggling.
Are you privy to the Customs Declaration Form submitted by the seller showing what he claimed the contents was, and its value, and its Harmonized code? Can you share what they declared?
If no tariffs were charged at all, there has to some type of fraud on the form, as the country of origin is still China, even if shipped from Japan. Currently, minimum tariffs of 15% are supposed to be imposed on all imports from all countries, regardless of value, and regardless of the contents. For new goods manufactured in China is currently 55%.