My initial reading was that the author intended to imply that philisophizing about memories was a repeated thing in Pratchetts writings. Which - given my limited exposure - seemed plausible to me.

Good article? Definitely not. But I've also read similar try-hard / pseudo literary blog posts pre AI.

1. The previous paragraph establishes a metaphor between furniture and memories. So you can take that sentence to also be metaphor, not literally about furniture.

2. A sentient animated luggage is a main character in the first two Discworld novels.