Yeah, it appears they’re two distinct statements. One is “people can safely consume up to 400mg a day” and the other is “doing so (drinking coffee) may have health benefits”. Strangely worded article for sure.

This doesn’t make a lot of sense to me either:

The healthiest way to drink coffee, according to the statement, is to brew it with paper filters or use instant—drinking unfiltered filtered coffee such as espresso is associated with higher levels of “bad” cholesterol—and avoid adding creamers, sugar, or flavored syrups.

Why would the manner in which the coffee is prepared matter - assuming the final amount of ingested caffeine being the same? Maybe we DO need more research into this.