I read on raddler that this is actually a privacy consern, the post are not actually delete just hidden, post link raddle.me/f/lobby. And I guess there should be delays in deletion across instances anyway since it is not centralized?

Edit: I found a longer explanation , link: raddle FAQ

Raddle’s strong privacy-focus and activist roots would make this a tricky proposition as federation depends on pushing user data to a multitude of different servers controlled by anonymous and often problematic (far right) people.

Rather than being decentralized as it’s often advertised, federated technology distributes data to a series of centralized servers owned by individuals with varying ethical beliefs, goals and motives. Anyone can set up a server and then fetch user-data from other servers to their server, giving them control and ownership over other people’s data and allowing them to use it indefinitely in ways the people may or may not approve of.

Furthermore, the federated technology currently in use in software such as Lemmy doesn’t really allow users to delete their own data. It lives on forever on all the servers its pushed to, creating a privacy nightmare and even serious legal issues due to the EU’s “right to be forgotten” laws. These laws are violated when the operators of the social media platform deliberately mirror all user-data to countless servers in perpetuity, even after it’s “deleted” by users.

In contrast, Raddle allows users to delete all their data from our server with a click of a button. Our server also doesn’t store the IP addresses of whitelisted users to further improve security.

Our users tend to heavily prioritize control over their data and have shown little interest in Raddle taking their posts and comments and deliberately pushing them to other sites they may or may not want to be associated with.