Mike,
I think it's actually the opposite - I may be wrong but I believe that Julien's question wasn't intended to debate the mechanics behind the charts or the business practices in the industry- I assume that he is intelligent enough to know that record sales and charts are something that can be messed with and that, at the end of the day, it doesn't tell the whole story.
To me, his question read as: is the album that successful because it's good or just because they're such a legendary band. He then specified that he hadn't listened to it. So to me, that's what the question was - is the album that good.
My answer - being the legendary band they are certainly helped the sales more than a bit, but the album has its own merits. Yes, it is a good Black Sabbath album.
The first single was a good hint of that and legions of fans have been praying for Sabbath to get together and record an album for decades. They announced they'd be working on it back on 11-11-11. Put all this together and you have a record that is likely to do very well when it finally comes out 18 months later.
It's not like they'd been putting out albums every 3 months and this was just another one. Then they might need the push. This comeback album meant something, it probably didn't need as much a push...
As for the role of the production team behind it, I don't think that that's what Julien wanted to discuss.
FWIW, Iommi and Sabbath had wanted to work w/ Rubin for so long - he is recognized for getting band back into shape, helping them to find their edge. I'm guessing that could be the first reason why Sabbath hired him. With Sharon Osbourne behind them, it's not like they were in dire need of someone to show them how to do business.