I have a number of their yellow Diesel cans. Though the risk oassociated with Diesel storage and transfer is much less than that of gasoline, the same warning is molded into the side of the “can” under the word “Diesel”.
Just a side note - anything that is “HDPE” is the same material as the “legal” gas/diesel jugs you can buy at Walmart.
That means those blue barrels with air-tight bungs will work just as well as (better than) a red, leaky, now hard to use modern “gas can”.