You are wrong. You need to read closer.
That rule EXEMPTS a foreign issuer in Canada from having to apply NI 43-101. It does NOT allow a foreign issuer to use it. You have it backwards.
You need to read more carefully. Read your first line again:
"Amendments to NI 43-101 provide for an exemption from the application of the Rule to a foreign issuer:"
Two little letters make all the difference.
Again, it is an exemption from the requirement to apply the rule TO a foreign issuer. NOT an exemption to allow a foreign issuer to use the rule. So, for instance, a US Company traded on the NYSE that would normally be subject to NI 43-101 for various reasons (such as an offering in Canada, a Canadian stock market listing, or a high percentage of Canadian ownership) would not have to comply with the law. They could continue to use Industry Guide 7 as required by US law, which does not permit US Companies to use it - they must comply with Industry Guide 7.
Geez. US issuers are prohibited by LAW from claiming NI 43-101, as it is a Canadian law. Companies like Mexus can no more use NI 43-101 as a US citizen teenager in Florida could walk into a bar and claim Alberta law which would allow him to drink alcohol at age 18.
Mexus' claim of NI 43-101 is FRAUDULENT. But what else is new?