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Just put the word "Blockchain" or "Bitcoin" into the headline for clickbait.
Neither are magic sparkle dust that will cure all known ills.
I fail to understand the relevance of the use of blockchain technology to the speed with which the transaction was exchanged.
Presumably a copy of the title had to be obtained form the Landlord Registry; the contract had to be drafted and sent to the buyer: the Buyer had to read the contract; the buyer had to submit his local and other searches: the buyer had to raise preliminary enquiries, and the seller had to reply to the enquiries. I doubt that blockchain technology helped with any of this.
The only indication is that the transaction was "recorded" in "just four seconds". I have no idea by what is meant that. What does recording the transaction mean? When did the stop watch start for the four seconds to be calculated?
Who is hosting this distributed ledger? Why are they bothering to do it?
With Bitcoin there are financial incentives to verify transactions, and it takes a lot more than four seconds to perform the calculations to do that.
I fear we have someone talking up something they do not understand.