You might be able to contact the guy running the site for the sources, im not sure to be honest but i think the numbers themselves are accurate given that this is the info about the guy who collated them :
'Jim Taylor is Chief of DVD Technology and General Manager of the Advanced Technology Group at Sonic Solutions, the leading developer of DVD and CD creation software. He is the author of DVD Demystified, the best-selling book about DVD technology, published by McGraw-Hill. Called a "minor tech legend" by E! Online, Jim created the Internet DVD FAQ, writes articles and columns about DVD, serves as Chairman of the DVD Association, and sits on advisory boards of leading-edge companies in the DVD industry. Jim received the 2000 DVD Pro Discus Award for Outstanding Contribution to the Industry, was named one of the 21 most influential DVD executives by DVD Report, was an inaugural inductee into the 2002 Digital Media Hall of Fame, and was named one of the Pioneers of DVD by One to One magazine. He has worked with interactive media for over 25 years, developing educational software, laserdiscs, CD-ROMs, Web sites, and DVDs, along with teaching workshops, seminars, and university courses. Before joining Sonic in 2001, Jim was DVD Evangelist at Microsoft, and was formerly VP of Information Technology at Videodiscovery, an educational multimedia publishing company.'
I get the impression he probably knows the numbers from memory! lol
EDIT: on the main page it says a BD version of the faq is out soon so that will be good for direct comparison
