proper inspection of cuts in tyres

Hello,
 The other day a STMA person came into my work and carried out a site inspection. He stated than in checking cuts in tyres the rules were 
1. If you look at a cut and clearly see cords then you can fail the tyre.
2. If you need to open or fold back the rubber in a cut and can then only see cords then the cut has to be 25mm or 10% of the section width before you can can fail as "the rubber will fold back over the cords and cover them and that is a pass and advise".
3. He also said there is somewhere in the book that clearly says this about the rubber folding back over the cuts meaning it would be a pass and advise. Funny thing is I can't find this and he wasn't forthcoming in showing it.

So I was looking for a wider group to help clear this up as I believe he is wrong and seems he has added 2 paragraphs together and made up a third rule?
Condition and fitment

Evidence of a tyre contacting a part of the vehicle, such as due to tyre flexing or suspension movement, is not considered to be a defect. A vehicle should only be rejected if the tyre is fouling a part of the vehicle at the time of test.



Some vehicles have lock stops comprising rubbing pads on the body that the front tyres may contact on a full lock. These are acceptable if they are properly maintained so that they do not damage the tyres.



When assessing cuts in a tyre, it is permissible to check whether a cut is deep enough to reach the ply or cord by using a blunt instrument to open the cut taking care not to cause further damage.



The following criteria should be used when assessing a cut in a tyre:



any ply or cord that can be seen without touching the tyre - fail

if by folding back rubber or opening a cut with a blunt instrument, so as not to cause further damage, exposed ply or cord can be seen irrespective of the size of the cut - fail

if a cut which is more than 25mm or 10% of the section width whichever is the greater, is opened with a blunt instrument and cords can be felt but not seen - fail

Before failing a cut, you must make sure it’s the cords that you can feel not a foreign object. If you’re not sure, then you should pass and advise.

Also seemly the only blunt probe you are allowed to use to check cuts is the corrosion assessment tool? I would say the cut would need to be a lot larger than 25mm to see pass the tool to see the cut.

Thanks in advance for any information on this query.