This was just someone showing you what the "Amazon programmer" was doing, and hence a deep cut reference to the likelihood of it being poor quality code :)

In the original code, trump_tariff is a sticky value. If that’s intended/not intended, the above introduces/fixes a bug.

    const

I feel you may underestimate how often they change.

not to mention the mix of snake_case & camelCase

If statements are great because they are highly readable.