Oh please, it's a well known proposed solution that still doesn't give us a failsafe and every Alignment Researcher ever has considered this:

https://www.alignmentawards.com/shutdown

Hell, so much so, that you can get awards, probably even tenure, for writing a compelling argument or providing technical research for how we could guarantee that we'd be able to turn off a super intelligent AGI. Thus far: no solution.

We have however found that even smart people initially think "just turn it off" will work.

Neil deGrasse Tyson used to think you could just turn it off. He has since changed his mind. So does every public intellectual I can think of that engages with the arguments in good faith. Even the OP article concedes AGI research into the possibility that AGI could kill us all is important (just that other things are more important right now). There is no argument made that "we could just turn it off" in OP and therefore we shouldn't do the research at all.

"All you gotta do is push a button", eh?

See https://youtu.be/ld-AKg9-xpM?t=30 for a counterpoint.

So do humans, and yet they can be quite troublesome.