According to the grammatical notes given us so far, it should also be correct to translate this question as "Are the Americans cooking with (the) pots?"
The audio doesnt sound like a question to me, but more like a normal expression isn't it?
Any reason why "Are the Americans cooking in pots?" is wrong. I'd talk about cooking in pots not with pots, although I do accept the construction of this sentence could imply the Americans are being cooked!
it is not good english. since swahili has no articles, you would erase 'the' in your mind, because 'the' is an article, AND it is an interrogative sentence which is generalising 'Americans'. Articles are only there in English because the logic of the English language's construction requires them. They are not used when the construction of the English language does not require them. (For example, when the subject of an interrogative sentence is a generalisation of all Americans.)