You're skeptical? Fair enough. Where else but Odessa could the drone boats be launched from, in the large scale and systematic way necessary, given that Russia controls all other ports on the Black Sea? So, they're in Odessa. If the controllers and factories were out in the open, Russia would have destroyed them all, long ago. So, they're hiding. Where else could they hide, except in the civilian apartment buildings, and why would the Russians be wasting valuable missiles on destroying civilian apartment buildings unless they contained important military assets like these?
You have some other explanation? Mine makes perfect sense, I believe.