Elon Musk is a controversial man, so I am not surprised at this news.
Anyways, I read the articles and I think this case lacks merit. I am sure there are no concrete evidence to back up such claims.
Dogecoin, just like every other coin is down and no one in particular can be blame for that.
Besides, no body forced him to buy, he did that at his own right and should bear the consequences alone.