Do you count Bluesky as the Fediverse? Why?

In terms of technology? Sure. There's projects that are considered "Fediverse" and don't use ActivityPub.

.... But the more important question isn't if it's "Fediverse". Sure it is. It's a federated network. The important question is is it part of the Indie Web, since the Fediverse started as a smaller part of the bigger indie web movement, and then the answer is a big no, because it's a VC-owned for-profit.