The technique that this sentence best illustrates is understatement.
Understatement means that you are not showing the full 'strength' of something, but it is rather understated - so here, the coach only said that 'he was glad' even though his team won the Super Bowl, which is a huge deal. So his emotions should have been way stronger.
What book needs to be read i maybe can help
We can't know about the statements you talking about !
1.After this bridge is built, our crew will move to another city.
2. My daughter is still considering to register for that carbs course.
3.Its nice I am now in London again. This is the second time I am here.
4. She blamed her classmate for losing the race yesterday.
5. Paris is known as the capital of light for ages.
