I don’t know how this poor advice even got posted. Strider bikes have been a thing for more than a decade. Any googling will point you to that advice over training wheels.
The actual hack if you don’t want to pay for a strider bike is taking the cranks off, not just the pedals. Cranks can still get in the way, or smack your kids shins. It’s not rocket science to take them off.
So this is a long winded “Think outside the box.” Except that the anecdote used is actually a poor solution.
Maybe I am just old, do people really need a PSA for this? I guess not everybody grew up watching MacGuyver.