Please provide a source that says baptized non-Catholics, or even a Catholic dispensed to marry a baptized non-Catholic, does not and cannot confect a valid sacrament of matrimony.
Your own source says it. pg2
."The great mass of christians separated from the Catholic Church (i.e. protestants, heretics, schismatics...the Orthodox possibly being an exception because they "could" have valid priests) do not admit the teaching of the Church as to the sacramental character of marriage."
Of course they don't. They have no priests to give them a sacramental marriage, nor do they desire one, because to accept that marriage is a sacrament (as the article continues) they would "have to admit...that the Church alone...has jurisdiction over the marriage contract.".
There are 3 different classes/questions raised here.
1) Could an orthodox couple have a sacramental marriage, being that they don't recognize the Roman Church as being their spiritual authority? I'd say "no".
2) Could a protestant couple have a sacramental marriage, being they recognize no spiritual authority, except the Bible? Obviously, no.
3) Could a "mixed" couple (1 catholic, 1 baptized non-catholic) have a sacramental marriage? I'm not sure, but logically I would say "no". If the couple isn't united in their decision to follow the Church's authority (since one of the spouses is non-catholic), then how can the couple have a sacramental marriage? The non-catholic spouse doesn't even believe that sacraments exist or are beneficial! It makes no sense that a sacrament could exist, which is why the pre-V2 church made it a REQUIREMENT to get approval for a mixed-marriage...because the spiritual ramifications of having a non-sacramental marriage were so dangerous.
If a marriage with a non-catholic, baptized spouse were a sacrament, then why was special permission needed at all? I think this is self-explanatory.