Here is an example of a token that updated their information to make it clear that it was a "dead" token. They gave the avatar a little triangle with a warning sign, and updated the description. You can also make a post on the seed-treasury blog to make it clear that it is a done project.

I felt compelled to give you that suggestion because I purchased your token a long time ago, based on the reputation that you have built here on Hive. I also see that you have started a new investment project and that the SPI Team is backing it, which to me means, you think reliability and transparency are important.

I don't remember seeing an announcement, and didn't find anything on the blog about why the SEED project was slashed.

If buy backs are still available, I would definitely turn the income around and invest in the new project.