No its not.

Nav creation/editing is not necessary – GMod npc's rely on Nodegraph and will work even if the map has no navmesh.

In my case, for this to work, I had to remove the .AIN file which was embedded into .BSP.
...and prevent nodegraph rebuilding (ai_norebuildgraph 1).

引用自 Kerouha：

No its not.

Nav creation/editing is not necessary – GMod npc's rely on Nodegraph and will work even if the map has no navmesh.

In my case, for this to work, I had to remove the .AIN file which was embedded into .BSP.
...and prevent nodegraph rebuilding (ai_norebuildgraph 1).

Как ты удалил AIN файл встроенный в BSP?

Dude, do you even test it before post it? even ai_norebuildgraph 1 they are still same thing with no nodes at all