Here is full text from the airport website. It is the 2nd paragraph below that got me going on this. MY flight is SAS via CPH also arriving Milan 1 September. Due in 19:15 if you happen to be there and want to share a taxi!
COVID-19 EMERGENCY: If you land in Malpensa from another Italian Region, EU Member States, Schengen Area Countries, UK, Andorra, Principality of Monaco, Republic of San Marino, and Vatican City State, you can use any public transport to reach your destination.
If you return to Italy from foreign countries other than those listed above (or if you visited one of these countries in the 14 days prior to your arrival in Italy), however, you will not be able to use public transport to move from the airport to your final destination, but you will have to use a private means of transport.
Visit the Italian Ministry for Foreign Affairs website for any further information.