The pulling of severance on job acceptance is a cheap move by Amazon, but not unexpected given their "frugality" in all aspects of their comp and perks.
Amazon famously caps base pay, so most people, even super senior people will not be making more than 160k/yr unless they were hired in the last year.
If you find employment externally during those 60 days, all payments stop and you get nothing more from amazon.
To get the 7 months of pay you'll have had to be at amazon 10+ years. That's like 3 people. Turnover for all roles is >100%, tech is something like 50+%
If you weren't hired this year your base is likely still around the 160k
But yeah, I'd take that gamble and just keep a low profile online. Or one could slow walk the hiring process: land a job then push your start date back out 61-x days.