Rock of Grimheim

I don't have kind words for Nixon's walkthrough, so I can only say that his walkthrough was ruined even before the waves started. Besides, he lost in the third wave, not the fourth.

It is assumed that the player will have to sacrifice something for the sake of victory. The map has plenty of fodder to replace losses.

I didn't watch the entire stream, only the final part of the scenario (these waves). As I understand from your answer, the problem is not in the tactics in the battles themselves, but only in the fact that you need to prepare correctly for them? And then the player will win anyway (with the right actions in these battles), right?