Sure, Renée Zellweger has been starring in major motion pictures for nearly 30 years, and has (as mentioned above) been interviewed and talked about widely for much of that time. Even though it’s hard to remember, not everyone is as committed to knowing any and everything about famous people as we are (We’re a team now, you and I. Enjoy it while it lasts.), so this basic information about where Zellweger grew up could have slipped right past Anstead during this time.
Plus, he was busy becoming a master mechanic, and it’s likely he had to focus on that for a long time, which could have eliminated brain space for things like where a random celeb spent the early years of her life.