Satellites are just part of the GNSS system. There are multiple control centers and network of sensor , uplink, telemetry, tracking and control stations around the world.

The problem is most likely on the ground. When GNSS satellites are not getting updated data from the ground stations their accuracy starts to degrade.

From the updated version of the linked article, looks like the ground station that keeps the clocks synced up is down or not giving the sats accurate date

Sounds kind of like the recent global Cloudflare outage. That outage started with a regex (WAF rule) being pushed out that immediately exhibited pathological backtracking behavior and "caused CPUs to become exhausted on every CPU core that handles HTTP/HTTPS traffic on the Cloudflare network worldwide."

https://blog.cloudflare.com/details-of-the-cloudflare-outage...

Wrong config push.

Yeah, bad regex.

Common frequency. Someones blocking them?

That could cause a regional outage but this isn't being described as such, seems global.