Although, he admits in the video to "faking" his footage of it working, by using a off-camera heat source. (His batteries were quite dead.)
But, as someone that lived through this time, they did work, as long as you pressed hard enough in the right places. It was hard to tell if the battery was dead or if you weren't pressing hard enough
On my phone? All the damn time, since I use a lot of jargon and shorthand that it doesn't understand, as well as a few neologisms. But, I'm a much worse typist on my phone.
On my Linux desktop or $dayjob's Windows laptop? Almost never, as it is much less aggressive about replacing what I typed.