Yes.
You can do the same thing without a bump stock by anchoring your finger in your pocket and slowly pulling the rifle forward with steady pressure until it begins to have the same effect as a “bump stock”.
Having said that however accuracy is very limited, more of a “spray and pray”.
This whole incident is fishy at the least and flat out ridiculous with the lack of transparency and details.
It pretty much only works well if you have a ton of targets in front of you because you aren’t aiming carefully.