Austerlitz finds this personalization creepy, though, because it also suggests that people aren't people anymore. It talks a lot about Europe in the thirties, about Facism and anti-Semitism getting more and more popular, and about the terror of people who don't WANT their subjectivity anymore. (Lettuce might be people, but lettuce-people can't do much about evil Nazis who've voluntarily given up their personhood to go marching together through Nuremburg.)
And Austerlitz himself has very little agency. Mostly he does things because inanimate objects—radios, ghosts, memories—tell him to. In a way he's a medium, I guess, letting the past speak through him. (In another, he's a schizophrenic, who mistakenly believes in voices that aren't there—except the unnamed narrator seems to find his stories quite reasonable, and I did too.) There seems to be a larger complaint about how twentieth-century Europeans lost their personhood just as objects were getting new kinds of personhood (radios are a machine that TALK!!!) going on as well—and while the de-personalizing of humans seems to be a problem, the personalizing of objects might not be terrible. Sebald's not afraid of robots, anyway.