Pep is a class manager but I thought he’d have changed things round a bit before now.
When 2-3 of your main CBs (Stones, Ake, Akanji, Dias was out too) are injured and both the 1st and 2nd choice for the DM position (Rodri and Kova) are unavailable, plus one of your most reliable defenders is past it and very poor (Walker), there is no magical solution.
Trying to play like a small team with a low block isn't acceptable. Plus, it's a tactics that you can't learn or adopt without preparation. Pep has coached the team to play a particular style of football that is incompatible with cheaply surrendering possession and relying on counters.
Even if changing tactics is useful in the short term, it may be counterproductive in the long term. You can't give up on your identity without any consequences. Our style has won us a treble, a quadruple, 4 in a row, etc. It's pointless to change it every time we go through a difficult period.
Remember, we lost 3 from 4 league games in December 2018, many were writing us off. Then we won 18 from the next 19 games. You stick to your identity no matter the circumstances. If Pep was as flexible and pragmatic in his tactics as some want him to be, then he wouldn't be the most successful manager.