Perhaps they're also not aware of the Letsencrypt intermediate certificate
expiring as well and they have some internal stuff encrypted with LE?
https://community.letsencrypt.org/t/r3-intermediate-certificate-has-expired-it-issued-certs-past-its-expiration-date/160797
The timings seem to be consistent

On Thu, 30 Sept 2021 at 12:48, Bill Woodcock via Outages <
[email protected]> wrote:

> …apparently Slack still don’t know why they’re down.
>
> Probably because they try to use Slack to discuss it.
>
> https://status.slack.com/2021-09/06c1e17de93e7dc2
>
>
>
>                 -Bill
>
>
>
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