what role does the patch config?

Your question doesn't make sense. If you're asking what has changed in the new update, they're listed in a topic in the "ChangeLog" forum category.

Quote:Added block of all unknown items, L2Tower shouldn't see them anymore.
Added block of all unknown (no name) NPC, they will be visible by L2Tower but internal PVE target logic won't target them (they name is "None" if you need to check for them in script/plugins).

What exactly does it mean? Now the anchor can't be caught or what?

Basically, if a GM drops an unofficial object that would typically be ignored by your game client, the bot will not try to pick it up. Same for NPCs, if they spawn an NPC that is not typically recognized by your game client, it should be ignored and will not be attacked.