I definitely remember reading on the page that you linked that a fix was coming on a specific date in December (sometime during the first week, if memory serves). But that same page no longer mentions a forthcoming fix at all.
It just suggests the only functional workaround: allowing all third party cookies. I don’t doubt that a better solution will be difficult. Safari’s updated ability to effectively and aggressively block tracking cookies is already legendary: https://daringfireball.net/linked/2019/12/09/the-information-ad-tracking
Since Apple introduced what it calls its Intelligent Tracking Prevention feature in September 2017, and with subsequent updates last year, advertisers have largely lost the ability to target people on Safari based on their browsing habits with cookies, the most commonly used technology for tracking. One result: The cost of reaching Safari users has fallen over 60% in the past two years, according to data from ad tech firm Rubicon Project. Meanwhile ad prices on Google’s Chrome browser have risen slightly.
That reflects the fact that advertisers pay more money for ads that can be targeted at people with specific demographics and interests. “The allure of a Safari user in an auction has plummeted,” said Rubicon Project CEO Michael Barrett. “There’s no easy ability to ID a user.”
So I’m certainly not going to turn all of that off, just to work around a problem that Duo needs to address.
I’m hopeful that Duo is still working on a solution, but has discovered that their original solution (and timeline) wouldn’t do the trick. But that hope isn’t based on any information I have from them, just my experiences with working with them in the past.