Almost. They probably still have some legitimate niche uses, which are fast fading- probably those will be gone in two years.
Sure, they still have their devotees. Vinyl platters, coal-fired steam engines, tube amplifiers and hand-braided buggy whips all have their devotees, and will continue to have, all of whom still vehemently insist that they have virtues lacking in later developments.. when they can find someone to listen, which isn't often.
Does that mean that they're not obsolete? No, it's just an illustration of human nature, and resistance to change. A technology is obsolete when there's no practical penalty for ignoring it.
For flashlights at least, overheated wires in bottles are fast approaching historical relic status now, and IMHO it's way overdue. Whatever their other virtues, they were just never very reliable. For most practical applications, there is just no penalty for ignoring them.
The niche applications may take a while longer to fade, but they are way past driving any significant market share. I bought my last one decades ago, and never expect to own another.
However, I can practically guarantee that long after the last commonly-available incan flashlight has dropped out of production, when younger people will have never seen one, or understand how it worked, there will still be people, maybe right here, loudly proclaiming their superiority, just as there are those loudly proclaiming the superiority of vinyl platers and tube amplifiers.
But there won't be any practical penalty for ignoring them.