It's actually not all that hard for autopsies to be "mislabeled", even here.
Look at the issue with the Pediatric Pathologist (Smith, I think). He had misdiagnosed multiple cases, with several being criminal cases, and nobody was the wiser for decades. In the case of Cherapanov, nobody would be listening by that point (if anybody is even digging).
The reason for doing it could be multiple, and multiple persons had reasons for wanting him to do it:
- the club has an interest in making one of their prospects look good, since that would attract other potential stars to their development program
- They also would want him to perform well for financial reasons (here as well, it comes down to the almighty $, or ruble, or whatever)
- Alexei would have wanted to excel in the eyes of his idol, Jagr, who he was playing alongside of
- The trainer would have wanted to have a real star developed under him on his "resume" as it would provide job security (as much as that is possible in pro sports)
- the league has an interest in not identifying those using PED, and for ensuring that evidence is hidden, as ultimately, they want to be seen as equal or better than the NHL, and the possibility of a myocarditis gives them an "out"
Having said that, the reports suggest that the stimulant used was nikethamide, which is a respiratory stimulant now banned, but previously used to treat tranquilizer overdoses. Toxicity can include arrhythmia, but I couldn't find a reference suggesting myocarditis, although certainly one can presume that it may cause myocarditis as a mechanism of causing arrhythmia.
Given the other options out there, and the ease with which they can be obtained, I find it surprising that he would choose this particular drug to use. This is why I'm not convinced.