I don't think they were saying the 505 wasn't as good as the 504. They said something about "in it's time". The 505 wasn't as much better than a Commodore as a 504 was than an HQ.
It's nice to see the 504 covered, a contrast to the usual diet of Aussie classics. I guess we 504 enthusiasts will always be hypersensitive about what is said, but I feel John did a pretty good job.
The specifications of the 504 are impressive enough on paper, but in my opinion it's the cohesiveness of the engineering package and the innate design quality that merely included, rather than resulted from, those sophisticated features. The 504 wasn't alone in rack and pinion steering, independent suspension, all disc brakes etc, but it did use that sophistication to brilliant effect.