Ahh... were you sleeping in 2021? They went down in September, November, and December. Probably some other times earlier in the year as well. I stopped keeping track at how bad their service is because of how bad AWS's service is.
I recall at least one of them I could not deploy new versions of my app though, which is pretty bad. I don't believe I had any downtime at all due to heroku platform outages in 2021. i believe you if you say you did though!
This particular outage definitely seems to be of a rare level of severity.
Didn't bring my deployed app down though! No user-facing outage for me.
This time my app was down for about 35 minutes.
As an aside, I spoke with our AE in early January on where they are going in dealing with AWS unreliability. One would think they would have a good answer. They don't.