From the article:

In May, on Costco's earnings call, Chief Financial Officer Gary Millerchip told investors that about a third of Costco's sales in the U.S. are imported products. Millerchip said items imported from China represented about 8% of total U.S. sales.

Millerchip said that while Costco was seeing a direct impact from tariffs on imports of some fresh food items from Central and South America, it decided not to increase prices "because they are key staple items" for its customers.

Some of those fresh food items included pineapples and bananas. "We essentially held the price on those to make sure that we're protecting the member," he said.

In September, Millerchip told analysts: "We continue to work closely with our suppliers to find ways to mitigate the impact of tariffs, including moving the country of production where it makes sense and consolidating our buying efforts globally to lower the cost of goods across all our markets."

If you look at Costco's actions in the past they have been pretty fair for their customers. Costco is actually in a very good position where they know exactly who bought what and Costco can issue refunds to their customers based on that data. Even if they just do it as 'store credit' it would still be very welcome to most of their customers and that would help to offset Costco's administrative costs of determining the refund amounts for everyone.

Maybe. It depends on if they raised prices first to capture the losses. I know that seems like what a business would do first and what everyone predicted, but did they?

If it's true, then Costco just needs to give away free hot dogs meals (drink and side) to their patrons for a year.

Maybe we need a class action saying the same

Isn't corporate profit at the expense of the consumers like ... the whole point of capitalism?

So, they shouldn't challenge the tariffs?

You didn't actually read the article did you?