what you described is either stablecoin or CBDC, they are ideal for this and the utilization of blockchain will further advance the underlying technology, right now some of the blockchain such as TON already surpass the TPS of centralized system like what mastercard is having by significant gap.
That's also the first thing that comes in my mind after reading what he wrote there. There is no underlying technology because the product is already there, finished and now being used by the many but there might only be continuous improvement that we can witness as the time passes by. The news/article that you share is impressive. At first look, I thought it was Tron but Tron is also fast and I think it can also handle lots of transactions per second.
It's also impressive on how a new created crypto/blockchain called Ton have now surpassed Tron and other once leading crypto but let's see if they can continue this momentum because this might only be a hype that they are experiencing now. They still have a long way to go to prove their selves. Another thing that is impressive is that cryptos such as Ton can surpass the potential of famous payment systems like Master card. I hope many people will now not underestimate them and they might now consider them as an alternative or better as a replacement, only to try new and exciting things.
I think if some government out there will try to utilizes blockchain and create their own fiat backed digital currency, then they will leverage on the fastest blockchain technology that could handle massive amount of txs.
Like we said earlier, there are now CBDC's and stable coins, and a few or many of them have came from the government their selves, the only thing is that I haven't seen one of them that surpasses other cryptos in terms of TPS but many or a few of them can still perform better as on what is their intended use.