There are a wide range of computer skills. Being able to interact with a word processor extremely efficiently is a highly valuable tech skill. Someone who knows about processor architecture but can't touch type is arguably more tech-savvy but also less useful in most office jobs. So I'd say that the secretaries were indeed tech-savvy in a way that was useful for their positions.

I don't even know how fast I can type on a phone.

Even with word completion I find myself hesitating between the choice of word or typing it out.

I know it's not near as fast as on a physical keyboard where is used to be around 90-120 wpm if I remember correctly. (Been a while since I had to do that at an employment agency)

Anyway, it'd be fun to see a thumbs only tiktok/Snapchat typer vs a mechanical typewriter type off.

And, tbf, most people are far from tech savvy.

Most are consumers. Some are really good consumers. Some are power users. Some know how to do things.

Very few actually understand it.

But, there was a time where there was indeed a necessity if you used the tech, you had to understand it.

It's a pretty good indicator. If you spend all day working with computers chances are you'll be able to type quickly