The thing is, when Bitcoin City fails, it won't make cryptocurrency advocates question their assumptions (like basing your planning on your ROI being 2000%, or that it is perfectly fine to entrust the running of major components vital to its success to convicted fraudsters), it'll make them feel more victimised by the "global elite" conspiracy theories and more aggressive in pursuing future schemes, as happened with the The Crypto-Currency Seasteaders (https://news.ycombinator.com/item?id=28441794).
Can't see how this can end well for the people of El Salvador, and there do seem to be some parallels with Albania in 1997.
For normal people this bond doesn't make sense (except for the residence that they get), but regulated institutions may want a piece of it. We'll see.
Seems legit.