Yes, but there are some small caveats to how this works exactly, based on the architecture. I'll get to it.

> all your friends posts

Your friends weren't banned, you don't have their posts in the first place.

> all your DMS

AT is 100% public, there are no DMs.

> you can't send data to/through blusky (or receive?) any more and and new data ?

Okay so, we have to talk about the architecture of BlueSky here. There's a few moving parts:

* PDS: personal data server. This holds your posts and such. Before this announcement, BlueSky ran the only PDS. What's happened today is that new PDSes are able to federate with the BlueSky run PDS.

* Relay: this is a server that aggregates data from multiple PDSes. Relays replicate data from the PDSes, and present it as one firehose of information. In some sense, today's announcement is "BlueSky's Relay will now replicate data from PDSes other than theirs."

* App View: this is a service that takes the information from one or more Relays, combines it with whatever other things they care about, and presents the information to an end user. bsky.app is an App View.

I like to think about this like git and GitHub. Your PDS is like a git repository. BlueSky is like GitHub.

So, when BlueSky bans you, aka, when GitHub takes down your git repository on their site, what that means is that they have decided they no longer wish to host your PDS, and they don't let you use their App View. However, if you have a local copy of your PDS, you can simply host it elsewhere, and notify the relay of it, or join a PDS that's already federating with a known relay. Once you do that, you can resume posting. If you don't have a copy of the PDS, I believe you can reconstruct it from the copies that have been federated around the network, but this part is a bit fuzzy to me. Even then, saying "Hey my PDS lives over here now" means your new posts will still get pushed around the network, and the people following you will see them, but you may need to rebuild your following list.

It's also important to note that like, BlueSky's relay could say "never replicate posts from this PDS", but that's why there's multiple relays. If you don't like BlueSky's policies about their relay or app view, use one that implements the policies you care about.

> I'd like to test this, any way to get someone from blusky to ban an account to test this?

This is one step towards realizing this future; for now you have to manually tell BlueSky to federate with your new PDS. The truly federated network is sloooowly coming online. So things will get there.