I know it is probably too late to respond at this point, but that was me that had posted on ECY facebook asking about ECY baltic lager yeast. My OG was 1.080 so i needed a pretty hefty pitch. I assumed a lower count than what was probably in there (200B) and did my starter to step it up to the...
Shaking does oxygenate (i.e. introduce air into liquid). Not necessarily as effective as other methods, but it is a simple and adequate method. As for this tinfoil business, i'm skeptical. Seems like a sanitation no-no. Have you had success with airlocks? bc that's where i'm leaning.