... so what happened to the 100k hour LED bulbs?

It never answers the question. It has an anecdote about the author's own lamps that ran an estimated 15-20k hours with an advertised lifespan of 30k and have degraded to the point where they will replace them. That's n=1 and nowhere near 100k hours, or even 50k as the author mentions early-adopters will remember seeing advertised.

The article contains a lot of info, but does not actually answer the original questions it poses in the title and the second paragraph.