Point them to the link on the page referenced above, which says:-
NOW TV - no contract
Not a Sky TV subscriber but want to watch football on Sky Sports in 2019/20? Not a problem.
Thanks to NOW TV, you've got the flexibility to watch our football - as and when you want, without a contract. Get a day pass or sign up for a Football Season Ticket for a one-off payment of just £199 - find out more.
and ask why ‘find out more’ doesn’t apparently take you anywhere where you can get the promised offer.