Getting hit with artillery with jammers?

So I had been attempting the scenario “infantry simulator” but kept losing. One aspect was that the enemy would build artillery and I couldn’t get anything up in time to counter it. But then I saw a guide video and he used radar jammers which I always forget about. So I put some up in the next round, but I was still receiving accurate fire from artillery beyond view.

This happened again later in a skirmish against a hard AI, but I realize there are some other units the ai could’ve been using, whereas in infantry simulator its pawns/grunts only. There wasn’t really an opening for a spy bot to get in though or a builder to make a camera or anything. Am I missing something?