This was the rest of the article.
"Since the UK parted ways with the EU, British holidaymakers heading to Spain without an EU passport must show they have accommodation arranged or risk being sent back.
Pretty straightforward if you’ve booked yourself into a hotel, hostel or apartment, but what happens if friends or family are putting you up?"
I always book alternative accomodation with booking.com with free cancellation for sits abroad. I print off the booking even thought I’ve cancelled if sit goes ahead in case I’m asked for proof of hotel etc.