They definitely changed their story. This one https://www.courier-journal.com/story/s ... 000353002/ from June 2022 says
The horse wasn't insured for being given a "let's just mix whatever together" shot and dying from it. They are probably SOL.The intent behind the Black Shot, Wharton acknowledged, was to increase the horse’s energy and his interest in breeding after five unfinished mating sessions in the two days before the injection.
here is Bloodhorse story from June 2022 as well in case anything else. https://www.bloodhorse.com/horse-racing ... inary-care
If they knew it was neck soreness there is no reason to give random crap in a shot. Its not going to do anything. He needed rested.