No It’s False. 

When you exercise in the morning your body tends to burn more fat. The main reasons why this is happening are:

1.      Low blood sugar levels force the body to look for other energy sources so it starts converting fat from the reserves to fuel.

2.      Some hormones that accelerate fad burning (like cortisol) are at high levels in the morning.

You can always combine your morning and afternoon workouts for better results. For example you can do a quick 10 minute cardio session in the morning and then a 20 minute intense session in the afternoon. This will also have a positive effect in EPOC (excess post exercise oxygen consumption) that will help you burn more calories after exercise.