They may or may not be cheating, but frankly, your provided clips don't prove it at all. If anything, they show slow reaction speed and bad ping. The 'under 1 sec window' can hardly be true when the convoy managed to get to the next map before getting plundered. Particularly in the first run, If you time it from Rik's clip, the convoy ran for at least 3-10 secs before being plundered. Its hard to think the server took more than 5 secs to update on the SS run. It's more likely your ping caused it to update much slower. You are assuming every plunderer shares the same screen as you and sees the SS at the same time, which is false. Even then, your reactions and refreshing were pretty bad if u ask me.

Its hard to prove usage of third party software like auto-clickers/auto-plundering. It might be more worthwhile to discuss and brainstorm how one might better prove it than post up clips like these and label these people cheaters.