He never says he's using FCP. On a Mac he very well could be but it's never stated for sure. 9.8MBps is the limit to keep a DVD standard. That includes video and audio bitrates. If he's using 44/16 audio he could use 8MBps for the video and the audio would be a hair over 1.5MBps. That goes just under the DVD spec of 9.8MBps total. There may be a setting in his program that tries to keep it under 8MBps total or something like that.
I use this calculator BTW:
http://dvd-hq.info/bitrate_calculator.php
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