Games are thought of as discrete data. You play in a game or you don't. Yes / No.
Here the study is talking about averages. In statistical terms, averages are continuous. You can have an average of 2.6 games. Or 2.3333. Or 2.19293. A continuous measure can include any fraction because you're looking at an overall summary of a whole bunch of games.
The most important conclusion of the study is the average of 2.6 games missed for hamstring injuries. So the best guess is that CMC will miss the next 2 or 3 games.