No, that site was not seized. The two campaigns that were seized are Chipmixer and Bestmixer.
Bitblender closed his services (Bitcointalk Topic: Bitblender shutting down?) after some of his addresses were placed on the US sanctions list after it was revealed that the North Korean hacker group Lazarus used the service to launder the proceeds of cybercrime.
you can read it here https://www.coindesk.com/policy/2022/05/06/us-treasury-department-sanctions-crypto-mixing-service/

Bestmixer is run by @Hhampuz Topic: [CFNP] BestMixer Signature Campaign | Sr. Members - Legendary | Up to 0.01225BTC  (Read 12291 times)