I can't remember seeing problems be more strongly worded than "Increased Error Rates" or "high error rates with S3 in us-east-1" during the infamous S3 outage of 2017 - and that was after they struggled to even update their own status page because of S3 being down. :)
During the Facebook outage FB wrote something along the lines of "We noticed that some users are experiencing issues with our apps" eventhough nothing worked anymore
Their entire infrastructure was unroutable for a while if I remember correctly. That is a euphemism if I ever saw one.
"Fixed a bug that could cause [adverse behavior affecting 100% of the user base] for some users"
"some" as in "not all". I'm sure there are some tiny tiny sites that were unaffected because no one went to them during the outage.
"some" technically includes "all", doesn't it? It excludes "none", I suppose, but why should it exclude "all" (except if "all" equals "none")?