Aware - and kudos to them for using Ethereum - It's a word play to confuse the market. Notice they don't say on Public Net. The installation is permissioned. I was involved with the first Yankee CD trade in 2018 with JPM. No investor can buy this without the KYC/AML checks, means if there's a wallet it's just a brokerage account - the underlying security is at a custodian not on-chain and the TA is still involved in registering the ownership of the share.
And here the press release: https://securitize.io/learn/press/blackrock-launches-first-t...