Yes, we are. 1-2 pound(s)+ (dried flower) is very easily achievable outdoors from a single plant with most strains. 4 or 5 pounds+ dried product from a single plant is not unheard of. Cannabis can get extremely large.
(this is actually inconsequential to the point of the article I just wanted to point it out).
500 grams is roughly a pound. 2 pounds (or more) of trimmed flower per plant is very achievable growing outdoors with many strains (not autoflowers).