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That's exactly the section of Public Law 414 I'm talking about. The circumstances of Cruz's birth don't meet the requirements. Read my post, carefully. You seem to have scanned it and misinterpreted what I said:
was physically present in the United States or its outlying possessions for a period or periods totaling not less than ten years, at least five of which were after attaining the age of fourteen years
The fact that Cruz's mom was a resident of Canada prior to his birth doesn't matter. The fact that (5) uses the modifier "at any time" [prior to] doesn't make any difference.
What is the rule that you propose (a)(7) imposes? What interval between entering Canada and giving birth renders (a)(7) inoperable? One second? One week? One year?
If you read the case law, the parental residence requirement, unless stated otherwise (e.g., "after fourteen years of age") is "at any time prior to" the birth.