The two solicitors are correct as far as Cruz goes.
They eschew all reference to Obama, and hide his potential NBC problem behind the phrase “subject to certain residency requirements”. Those pesky residency requirements are the legal crux of the theory as to why Obama is not a natural born citizen: that he was born in Kenya to a non-US citizen foreign father, and a US citizen mother who had not been resident in the US a specified number of years (I think 5) after reaching age 14. If born in Kenya or Canada, etc., under those circumstances, Obama would not receive any sort of US citizenship under explicit US law in effect at the time he was born (and changes to this law are explicitly NOT retroactive). I do not ascribe to the Kenyan/foreign birth theory, but Obama promoted and/or acquiesced to the idea for years. Since no verified evidence exists in the public domain to disprove his claim, it remains an open question.
Cruz’s mother met the explicit legal requirements for her son to be a US citizen at birth. It is not a comparable situation to Obama’s.
Has anyone heard it discussed further on the rumor that Cruz’s mother took out Canadian citizenship? If true, and it was prior to her son’s birth, this could present a problem.