Is there any video of Nick Szabo actually saying that central banks will adopt Bitcoin in 2019?
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Of course a smart guy like Nick Szabo couldn't make such a stupid prediction.
The closest thing he said at the Israel Bitcoin Summit (after explaining vulnerability of the Swiss government) were the words quoted below:
... and so a more trust minimized solution is cryptocurrency, to hold some of your central bank reseves in cryptocurrency ...
and then after explaining the physical vulnerability of gold reserves he added:
... so that's a very suboptimal solution to what you would hope to be trust minimized secure reserves, and you can do a lot better with cryptocurrency in that regard.
You can see it for yourself following the link below (starting at 50:52).
https://www.youtube.com/watch?v=8Rd_YYzf86M