There is enough historical events to give russians a bad name, why must you create more I wonder.
Not sure why you think he's making it up, that the Russians totally neglected the postwar restoration of Königsberg is hardly a secret. They've done just as bad a job with other annexed areas, only reason they're not quite as fucked as Kaliningrad today is that they weren't in such a bad state when they fell into Soviet hands. As for the other thing:
About 120,000 survivors remained in the ruins of the devastated city. These survivors, mainly women, children and the elderly, plus a few others who had returned immediately after the fighting ended, were held as slave labourers until 1949. The vast majority of the German civilians left in Königsberg after 1945 died from disease or starvation, or in revenge-driven ethnic cleansing.[65] The remaining 20,000 German residents were expelled in 1949–50.[66]
I'm sure you could find lots of sources if you were actually interested.