I've read it now. I still think it's obviously wrong to say that JavaScript can't be used for this. It's not like we are comparing Closure with Cobol here.
I highly doubt using datascript will give you a significant advantage over competitors in the long term, and I say this as somebody building pretty much a competitor app with Electron, but that's more a matter of personal opinion so I can only wish you good luck about that.
Main reason is access to datascript, one of the only client-side graph databases, which doesn't work the same with JavaScript.