This is not the official stellar twitter that you are linking to. Actually its a clever way to promote the ref link in the stellar lookalike twitter.

This token acts like a normal bond. I dont see or i canot find calculations of the variable part of the token earnings you can receive. How much would that have been if you would calculate these based on the past?

How do they guarantee the buy back of the token at face value after 10 years?

Overall, 1% per quarter is an ok return, but id think there are saver ways to get these kind of returns like in normal bonds.