I don't know that I'd agree with most of their assertions about VB, they look more like 'myths' to me... especially:
"subtle quirks which can hide issues and make it very hard to write reliable, maintainable, performant code".
One could say that about just about any language, because dealing with those is about code style and standards within an organisation, and little to do with the language itself - I mean most entries into the "Obfuscated C" competition (
https://github.com/ioccc-src) can be trivally converted to C# and be very "quirky, with hidden issues, hard to maintain....".
As for the future of VB. There have been some stirrings in the VB community, and the former 'boss' of VB at Microsoft, Anthony Green, is hinting at a 'community takeover' of the language, since it is largely an orphan at Microsoft (although there is still some development being done, it's mostly just bug fixing). There is a significant backlog of feature requests that would be quite trivial to implement for an open-source community, but within the corporate behemoth that is Microsoft, "bug compatibility" and "not breaking old code" takes precedence over enhancing the language.
As for old "parity with C#", there's a lot of understandable misunderstanding about what that means (or meant), but it never meant both languages always doing the same thing but with different syntax tokens - that same Anthony Green wrote about it recently on his blog at
https://anthonydgreen.net/