No. In fact, the U.S. consulate did exactly the opposite.
My experience was the same as that of the grandma in Vancouver whom I mentioned. I called the U.S. consulate in 1973—so that was 41 years ago—and they told me clearly, firmly, and directly that I was permanently and irrevocably relinquishing U.S. citizenship.
I had no idea the Americans still considered me to be a U.S. citizen or a U.S. person until 2011, when a friend sent me an article that had appeared in the Financial Post, indicating that without my knowledge and consent, the U.S. Supreme Court had reinstated my citizenship in 1986.