I think that percentage is entirely too high.
Also, you are comparing what others cook to what you do and so completely disregarding their efforts if it doesn't meet your own level of cooking.
There are many reasons why people don't cook, it doesn't necessarily mean they can't.
They weren't brought up with home cooking, didn't learn to cook well or just weren't and aren't interested in cooking.
Working long, unsociable hours.
Money, whichever way you cut it, this plays a huge factor.
Literacy levels, 1 in 5 adults struggle to read or write, navigating the supermarket is daunting enough, yet alone trying to follow a recipe and figure out what you need and quantities, and whether you have enough money to pay for it when you get to the till.
One thing I noticed at the beginning of lockdown was how empty the sections of the supermarket were that had all the convenience food and all the frozen kids staples.
In America, it is often cheaper to eat out than to go and source the ingredients and cook it yourself.
In the UK, we have all the takeaways like the Golden Arches, etc. They are cheap, there is product placement across the board on the TV.
I could go on and on but it's simply not an open and shut case.
I also think during this current pandemic, that takeaways are probably deemed more of a treat now than ever so there's that too.
I personally cook from scratch most nights, but I was lucky enough to be brought up in a household that had the money and means to cook, and I have a very comfortable food budget (at the moment) each month. I also really enjoy cooking (for the most part) and I'm certainly a lot better than a lot of people I know, but I wouldn't judge them for it, or think this means that 97% of people can't cook.
I also tend to find, that if someone eats at my house for the first time, they don't always reciprocate and I think this is because their standard of cooking isn't up to mine, even though anything tastes better cooked by someone else and I'd be delighted with a bit of cheese on toast!