2.5 x bodyweight deadlift for 8 reps puts one at 3x bodyweight 1rm. That's probably 6-12 months training (50-100 lbs) from being elite. Granted, these are enhanced numbers. But I don't think powerlifting makes distinctions in terms of strength standards, being enhanced or not. It's the lifts in each class (super heavy classes especially) where enhanced is a fact and the super elite, super enhanced, super talented and super persistent specimens put up world class numbers which set them atop in the records and in their own standing.
In other words, 3 x bodyweight is elite at about 180. In that weight and higher weights, very few will every pull 3x bw. After that, elite is less than 3x bodyweight because 500<to>600 is a time consuming progression that disqualifies people in two ways. Lighter lifters will have to spend years closing the gap to 600 lbs, which is the cutoff almost no lifters will reach. Heavier lifters will require quality body weight to support such numbers and that means 600 lb deadlift is doable by people who carry bodybuilder type lean body mass and have access to enough drugs. 700 lbs deadlift requires enormous muscle mass, innate strength, and talent/build for the lift. 800+ lbs deadlift requires unfettered access to steroids, growth hormone, insulin, over a long period and the several years of programming to build up technique, strength, coordination, balance, problem solving, specialized training, and injury prevention to be feasible. 900+ lbs deadlift requires all of the above and additional emphasis on commitment, anatomical preferences (long arms, thick biceps tendons, strong spine, small to medium stature, thick bones, long fingers, short femurs. 1000+ lbs deadlift requires all of the above and even more weight (muscle and fat), so bigger stature and being one of the few super heavy strongmen/power athletes with iron determination and perfect mix of everything is required.
600 lbs deadlift is a cutoff. A lot of people perform this lift but 99+% of lifters will be unable to hit this number. Among the general population, maybe 1 in 10,000?