It’s not.

David Talbot isn’t introduced until Queen of the Damned

Also, The Vampire Lestat starts out in France in the 1700s.

In the winter of my twenty-first year, I went out alone on horseback to kill a pack of wolves.

This was on my father’s land in the Auvergne in France, and these were the last decades before the French Revolution.

I read the series as far as it went back then when I was a teen and even then I oupd notice the quality diving deeper and deeper with each book