It looks like you may not have read page 2 of the guide either?
As it does not profess to be.. It is a joint contribution document by 13 listed trades bodies / organisations.. Who believe the information to be correct...
And also states that feedback is welcome from anyone..
So if you have concerns about accuracy of any of the guidance there is an e-mail address you can use.. (But possibly you do not consider that any of 13 listed bodes have any industry related relevance or useful purpose, to offer anyone ?)
View attachment 16974
View attachment 16973
I have added a couple of images to assist, as at appears you don't like searching / reading too much yourself?