Unverifiable canary
I have tried to verify that the warrant canary is not post-dated: https://source.puri.sm/Purism/warrant-canary/blob/master/canaries/hardware-warrant-canary-20200701.txt
However, I couldn't. The reason is that the news titles are quite generic (as in, there was no scientific breakthroughs obviously recognizable as something that has happened in the end of June), and many of them would have made sense back in April.
Even worse, the feeds.reuters.com domain name does not resolve, so now, on July 7, I cannot compare.