While I do not consider that every priest is a Canon lawyer, or even necessarily clear on Canon law as it applies to people entering the Church, it would appear that we have gone off the tracks on an esoteric field trip through various parts of the Code.
I am willing to cede the issue to the priest who convalidated their marriage, that he found it appropriate to do so. And by doing so, I also cede any questions concerning whether or not the OP ever formally defected, or didn’t, or if it is even relevant.
I know that Abraham Lincoln individually studied the law; but a) that was civil law; and b) it was a tad less complex then than it is now. The matters discussed herein are not civil law, however, and I don’t recall anyone who has individually read the law (as opposed to having taken classes in it),sitting for exams in hopes of achieving a JCD orJCL… Further, in reading the Canons themselves one can easily presume that all necessary information concerning the application of a passage is contained within the passage, forgetting that the Church may consider other passages relevant, not to mention prior decisions.
In any event, the discussion is not relevant to the OP’s post. If there was an issue, it has been resolved; and if there was not an issue (formal defection) that also has been resolved.
Perhaps we can get back to responding to the problems the OP has encountered from individuals she has encountered, and who have caused a great deal of consternation to her?