I have my doubts.
Sure there will be sandboxes, but they have bugs and errors too.
Oooh I want to add my favorite: No flying jet packs, unless you can figure out how to create a longlasting stream of gas of sufficient momentum to lift a human which won't burn his legs off.
For a laugh i once calculated the neutrino "jet pack" plausibility. Apart from MW and GW of required power, *even* neutrinos in sufficient momentum density do interact enough to still burn the legs off.
More seriously: About the only thing that would work is go bigger, ie a back pack gyro or something.
A good scientist doesn't waste time on bullshit. And violating momentum conservation is bullshit.
reactionless propulsion in a vacuum means free energy. Literally it is an over unity device. Yea pretty safe to call bullshit if that is what is claimed.
Oh and this is in newscientist. If you want shit science stories its the place to go. For good stuff, not so much.