It's not necessiraly wrong, but it holds just as much for any other genre of music and the choice of "EDM" to make the point is pretty typical.
I listen to electronic music for 25+ years, different genres and I never grokked what exactly is EDM. To me it's a vague hodgepodge of mainstream pruduction spanning anything from Guetta to Skrillex.
People around me who like electronic music refer to it as techno, house, dnb, psytrance, hardcore, what have you. There are crossovers and there are multi-genre festivals. But no one says "I am going to an EDM event tonight"
There's expectation that you will hear some classic hits but people expect to hear something new as well.
Edit: Wikipedia actually shines a light on the resurfacing of EDM "brand" in USA https://en.wikipedia.org/wiki/Electronic_dance_music#Termino...
To name three "Electronic Music" genres, if you compare Hardstyle vs UK Dubstep vs Tropical House, I'd say the difference is much bigger between any pair than "Nu Jazz" vs "New Orleans Jazz".
You can conveniently grow an opinion on this here: https://everynoise.com/
There are genres of electronic music that are like metal (very uptempo, in-your-face, maximalist) and ones that are like jazz (smooth, free-flowing, open, not maximalist). Both being very common and huge subgenres. But where's the jazz that sounds like metal or the metal that sounds like jazz? They might exist, but would be incredibly niche.
Besides, people nitpicking over subgenres exists in many genres. Metal (or really "Music featuring heavy electric guitars") is famous for it. But in both it's only a small minority of people who spends their time doing this, mostly teens or people online, very rarely people actually visiting and enjoying shows.
"Jazz" should be compared to "Techno". And people definitely go to "Techno" festivals, even though you can further divide it into "Hard techno", "Industrial techno" and so on.