I can't read the 4th amendment and this article and not come to a conflict. It seems obvious to me that it is unreasonable to expect a person (with the average IQ being 94-98) to understand what data on their phone is public or private.
It's obvious because we have millions of teenagers believing they have privacy on their phones to a point where they break incredibly consequential laws to store sexualized imagery there.
What the average citizen believes is private is where the goal posts should be.
So a potential solution is to poll America asking the following question:
Donald Trump and Joe Biden would both like to download all the data on your phone to share with the world via press conference. Do you accept? If 50% of people so no, it is unreasonable.
Disclaimer: I worked on Geolocation products with the top 3 aggregators and have extensive experience with Palantir.