Yes, that would have been a hard lesson to learn.
If you watch the 3rd video, the one on "rat killing", it clearly shows how the rats carry off the baits. In fact, it even shows the guys intentionally placing baits at the openings to the tunnels, knowing the rats will take them inside to eat, then die in the tunnels. If a person's situation were such that no pets, no kids, no nothing was going to find and eat the baits, that might still be something to employ today. But that might only be 1% of the time. The rest of the time, far better to use secure, tamper proof bait boxes (keeps kids out) and use only the ones that have "pins" inside to hold the bait blocks in place and for that exact reason. Rats will drag any loose baits out into the open and scatter them around for non-targets to find and you really don't want that to happen.