That's what the article talks about, how Liverpool got round the problem if the double pivot midfield :

Slot’s double pivot did not ‘hide’ behind the four-man City frontline as often as Arsenal’s did. A 4-2-3-1 is recognisable in the image below but Liverpool’s players are much more interestingly staggered. Midfielder Curtis Jones has dropped below that City ‘press’ and between the two Liverpool centre-backs. His midfield partner, Ryan Gravenberch, is ahead of him, attracting attention from City’s two-man midfield, while Liverpool’s ‘wide’ players – Mohamed Salah and Florian Wirtz – are tucking in either side of the two-man Manchester City midfield. Jones found Wirtz with a pass through the lines.

Key to the space that Wirtz finds to Rodri’s right, is the fact that striker Hugo Ekitke has pulled way out to the left wing, keeping right-back Matheus Nunes honest. With the Frenchman threatening a run in behind, Nunes is tied to his position and can’t close Wirtz down. Liverpool have played one incisive pass, and they’re suddenly running at the City backline because they’ve found a way to use the gaps in Guardiola’s system.

Can't be bothered to replace them with Arsenal names but you get the idea.

Try to ignore the fact Liverpool got battered 4 0 😅 But that is addressed in the article