That's just informational, that doesn't dictate that a reboot WILL be required, post installation.
Usually, any application deployment the reboots are governed by "what the exit code says".
If the exit code of the installation is 0, CM will know that a reboot is not required. But if, for example, post-installation the exit code is 3010, CM by default knows that means "Success, but reboot required", and the behavior you elected to happen in that situation will be triggered (don't reboot immediately, or a reboot will be triggered in xx minutes, it's all choices you made usually early on in configuring your CM)
Basically, if whatever-it-is exits following installation with a "0", there won't be a reboot.