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I think the "spirit" of pairwise IDs in SAML would make it improper to just forward them into the Internet as an OIDC claim. They were always intended by the original Liberty work as "secret" in some sense and not to be shared gratuitiously, so I think turning a pairwise ID into a non-pairwise ID through a proxy is not really appropriate unless the proxy is "inward" facing. I don't think the document is presuming that though. If the intent here is rather that the proxy be stateful and do a mapping from the inbound SAML value to an outbound pub claim, that isn't coming across as clearly as perhaps intended.

It may be a similar question in the opposite direction but I don't claim to speak for the "intent" behind the pairwise nature of the sub claim in OIDC, whereas I can speak for what the intent was in SAML.