Both my laptops and phone I need to be the one actually typing or inputting the code, I know them through muscle memory and get tripped up those few times my laptop ask for my iphone pass code, as an example
So, in the context of this UK-focused article, you're giving people advice on how to evade a search that, in the UK, is legal.
Instead, I would suggest advocating for UK people and businesses to change the law.
The only thing that politicians are afraid of is the media, and British people are sheep who follow the prevailing media narrative. If you want to change the law in Britain: buy a newspaper publisher.
It's an almost symbiotic relationship with the government.
That made me think if I were in that position to hand over or unlock a device, I could imagine the stress of the situation causing errors or even wiping the device. I imagine would be hard to prove intent but probably more difficult to prove it was unintentional as well