He wrote honestly about a profession he worked at all levels. His travel/food programmes sampled the fanciest of foods as well as the greasy spoons, local cuisines, and all without arrogance or false humility. He was very relatable for many people.

I would recommend reading Kitchen Confidential. Alternatively watch any of his travel shows although I think understanding the man through the book first makes it easier to appreciate the shows.

Regarding this specific find I don't see anything particularly special but for many it's one final glimpse into the life of someone they admire.