I mean sure we can posit that the Second Secret would not work because Vlad has the First Secret Prime or something, but that is unfalsifiable unless and until he actually breaks out and built on a foundation of 'surely he would not be that arrogant'... the immortal vampire prince would not be that arrogant. I don't really buy it.
Vlad is a Von Carstain, he does not really have the 'seem alive' tricks of the Lahmians, especially not ones that would stand up for long in the new and very paranoid witch hunter lead greater Stirland.