Personal view: beware of anyone telling you that they have financial engineered a new security that pays 5% interest with no risk.
Reminds me a bit of the CFD and spread betting crowd claiming their products as being the same as share ownership.
Essentially, they are going to pay you 5% interest out of their own pocket as a marketing / client acquisition cost. Presumably financed by crowdfunding investors as they are not lending out or investing the funds to earn a higher interest rate.
I don’t think this is being presented transparently, rather, it is being presented as an introduction to investing and bonds more generally.
I don’t think it’s good for new investors to think there is a way to earn 5% interest on a bond with no risk.