I think what the writer of the article discovered is genuine, but then I'm clearly biased. I'll even admit that some Deadheads are OK.

'How I Learned to Stop Worrying and Love the Grateful Dead'
If you’re like most people, I was once like you: I hated the Grateful Dead.
Even as a classic rock-loving teen in the 1990s, I could not fathom the appeal. The studio albums (with a couple of exceptions) were goofy and uninspired. The badly recorded tapes of thousands of live shows did nothing for me. The music struck me as aimless and dreary; the lyrics sounded like they were written by guys who were born old.
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[D]espite being a (metaphorical) hippie-puncher for much of my life, the aura of the Dead now makes me feel young, free, and… healthy. (The last of those is a particularly perverse association for a band so synonymous with drugs and debauchery that its de facto leader, Jerry Garcia, essentially died of old age at 53.)
I guess you could call me a mid-life Deadhead. How could this have happened?
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It started slow, but it’s gotten to the point that I play the Dead often enough that my kids have their own shorthand to mock me for it (as they should). And my wife has patiently indulged my need to travel to see some of these shows, typically with friends going through relatable midlife crises—and becoming latecomer Deadheads.
I still feel somewhat self-conscious when talking about it to non-Heads, but the Dead—and all its ancillary experiences over the past decade—have brought me comfort, new friendships, even emotional steadiness. I’m less judgmental, more empathic, and open to discovery (though my capacity for forgiveness could still use a little more seasoning).
And though I still find the experience of dancing to shitty pop music at weddings physically painful, I can dance to the Dead like no one’s watching—proving that old dogs can learn new tricks when the right treat is available.
You’ll still never see me in tie-dye, or stinking of patchouli, or tolerating anything associated with Dave Matthews Band. But after a few decades of generally loathing the Grateful Dead, Deadheads, and ostentatious, boomer-created, hippie culture—what can I say but to call me what I am?