I found that - not convinced I understand what it's saying though. Need to read it a couple more times. Tend to agree with wtcoffee that it should be less not greater but more examination required.
The bit I was referring to that's not convered in Jar Ops is the manual Cat 3 stuff using HGS. Not a mention.
Maybe it's covered by the phrase
"....Other forms of guidance systems or displays may be certificated and approved."