I've called BS on that since day 1 and decades of research by Tom Roster has pretty much proven that. I said right from the beginning the guys who claimed you couldn't kill with steel didn't kill any better than they did with lead and I've hunted with plenty of them. The good shooters I've hunted with could kill just as effectively with steel as lead because they shot well enough and could judge range well enough to centre birds in the pattern. Steel gave the marginal ability shooters the excuse they needed for their misses and crippled birds.
As for target loads it is now less expensive for ammunition manufacturers to produce shot made from steel than high antimony lead and steel is HARD and patterns much better due to not deforming when fired. I hear alot of claims if steel shot became mandated for the clays games many would walk away but I've shot steel shot target loads on several occasions and it worked very well on sporting clays, skeet and 5-stand. I have never tried it on trap. It would be interesting to try it from my assigned yardage of 25.5. I would not give up the clay shooting because of a shot change. I'm actually kind of surprised in this day and age that more clubs and ranges haven't switched over.
https://www.outdoorlife.com/guns/steel-shot-lethality-testing/?amp