Popular culture reference from the film The Thin Man (1934), Nick Charles explains:
"You see, the important thing is the rhythm. You must always have rhythm in your shaking. Now a Manhattan you shake to foxtrot time, a Bronx to two-step time, the dry martini you always shake to waltz time."

I assume the instructions should be "SHAKE ALL ingredients *except red wine*"

Actually, maybe Aperol has changed their recommendation, but it is now 3:2:1

https://www.aperol.com/product/aperol-spritz-ritual/

• Fill a white wine glass with ice
• Pour 3 parts of Prosecco D.O.C. (9cl)
• Followed by 2 parts of Aperol (6cl)
• And 1 splash of soda (3cl)
• Garnish with an orange slice

Agreed!