Unfortunately the source of that note, an article in the Economist from 2006, doesn't indicate when they tested. Standards and expectations of airline passenger comfort have degraded significantly over the years, so it might be reasonable to retest.
Although, I found an article from 2018 [1], quoting a Boeing VP of Product Development and Future Airplane Development, which basically says a blended wing design for commercial passenger aviation is unlikely because the required minimum height for passenger loading implies a minimum width that is quite large, and may not be very compatible with existing airports.
Although, I found an article from 2018 [1], quoting a Boeing VP of Product Development and Future Airplane Development, which basically says a blended wing design for commercial passenger aviation is unlikely because the required minimum height for passenger loading implies a minimum width that is quite large, and may not be very compatible with existing airports.
[1] https://leehamnews.com/2018/04/03/dont-look-for-commercial-b...