It's apparently a partisan issue. Take a look at the White House's response.

> * White House press secretary Karoline Leavitt said she had discussed the Punchbowl News report with Trump, and his message about it was: "This is a hostile and political act by Amazon." * [1]

The Trump administration has expressed a clear expectation that businesses like Amazon should pretend tariffs are paid by foreign countries. Transparent pricing is now disloyal.

[1]https://www.reuters.com/business/retail-consumer/white-house...