No, we do not consider it to be plagiarism.
The question was written in the author's own words, so that is pretty much the end of the matter, as far as Stack Exchange questions are concerned.
No doubt many people reading the BBC article would have had the same basic question raised in their mind. It is not surprising that more than one person in the world chose to ask about it on one Stack Exchange site or another. There are probably other similar questions posted in response to the same article on non-SE sites as well.
There is nothing to suggest we should do anything other than assume good intentions here.
Speaking more generally, if a pattern were to develop, the community might decide that a user's contributions were becoming disruptive or just not in the best interests of the site, which could have consequences. I would stress that there is no suggestion that is the case here.
Relax and enjoy the extra views and upvotes the link to your question has generated.