Sorry, your engish isn't so great, and I'm stuggling to understand what you're asking...
But in general the answer to questions of the type "Does the host do [x]?" is that hosts are all different and will do things their own way. There'll always be a wierd one that does things in an unexpected way.
looks like they're asking if there's some sort of flag sent to the plugin when a block is silent. I would have to assume the answer is no.
plugins don't add latency do they (unless you build it in, for some reason)? I would assume they just process the block in series, at the same time as the host's audio processing...so there would be literally no way to know if i block is silent or not, without making at least 1 block delay.