Subclass 187 policy is inconsistent with legislation

If the applicant with overseas qualification is not exempted and is not nominated for a trade occupation specified in the relevant legislative instrument, they must demonstrate that they have qualifications listed in ANZSCO as being necessary to perform the tasks of the occupationOn-the-job training
The following are considered to be equivalent:
- an Australian Certificate III obtained with 2 years of on-the-job training
- an Australian Certificate III obtained without the on-the-job training, provided the holder has 2 years of post-qualification work experience.
Alternatively, provided the ANZSCO framework (indicative skill level) allows for this, the person may demonstrate 3 years of relevant experience in lieu of the formal qualification.
If the applicant is nominated in a trade occupation, only Australian work experience can be counted towards the two years of post-qualification work experience (where required), or as a substitute for the formal qualifications, as per ANZSCO and 187.234(c). Any overseas experience in a trade occupation cannot be used as a substitute for overseas qualifications under 187.234(b).
"Any overseas experience in a trade occupation cannot be used as a substitute for overseas qualifications under 187.234(b)"
It this a typo or is there a hidden meaning?
Secondly - When did overseas experience as a trade cease to be recognised by ANZSCO and why? To us the key here is ANZSCO - not a policy modified version of ANZSCO.
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