Do multiple land claim blocks still prevent zombie spawning?

Research shows that LCB doesn't stop spawning. There isn't anything super conclusive, but it looks like the following stops spawning:

• Your bedroll (41x41 area by default)
• Player made "building blocks" (specific types of things classify)

There isn't any mention of LCB stopping spawning.

On top of that, certain types of spawning are not affected, like Sleeper in POI. If you build an existing POI into your base, some respawns may not be preventable.

Sources:

March 2016 reddit post

A16 release notes