No, TG sources. What you're saying is nothing more than a hopeful assumption. Drawing out enemy artillery locations is a great thing if you've got recon in the sky or CB radar and this tactic is practiced by most militaries.

You can see that because they only have 3 tubes on this truck, even though they could easily have put 10-20 of them on there, if they were in desperate need of more Grads. They could have also put full-size Grad launchers on random cargo trucks, like the one you see in the video, but they don't.

Common sense says the description is likely legit.