Need Some Help from experts Understanding this LUA Logic

Hi everyone, I'm trying to understand the following phrase (from LiveUpdate Administrator Installation Guide):

Note: Even with a single content update revision, LiveUpdate Administrator can typically provide incremental content updates to connecting clients that have content outdated for up to 12 months.

I know how SEPM works to provide delta-update: summarizing, if the client has a definition older than the oldest one present on SEPM, delta-update cannot be provided and the client should download full definition.

This in SEPM.

How can LUA provide incremental content update (for me, delta-update) up to 12 months with 1 definition only?

Any help and explanation in easy way to understand this logic would be greatly appreciated . Thanks