Of course they are counted as Covid hospitalizations, because they requires the same special care as all other Covid cases - you can't just put a Covid-infected patient in the regular orthopedics ward, you need to quarantine them and all the staff that comes into contact with them.

Also, I doubt the amount of people suffering from broken legs are really skewing those Covid numbers. Most people sick enough to require hospitalization while also infected with Covid will have much higher risks of Covid-related symptoms as well.