I think the disconnect between the story and the anecdotal evidence on the thread has to do with which models are being sought. I know this breakdown is US-centric, but:
5 networks (AT&T, Verizon, T-Mobile, Sprint, no sim)
4 colors (Space Gray, Rose Gold, Gold, Silver)
2 sizes (16 GB, 64 GB)
That makes 40 combinations. I don't know anything about networks in other countries, but even if you have only one network, you still have two choices (on-network and sim-free), which still gives you 16 combinations.
Back to the US...I'd expect that exactly four of those 40 combinations are really popular:
AT&T / Space Gray/ 64GB
Verizon / Space Gray / 64 GB
AT&T / Rose Gold / 64 GB
Verizon / Rose Gold / 64GB
You could debate if there were other popular models or whether Rose Gold is really that popular (according to the salespeople I spoke with it is)...but you could go about it the other way: wipe out all the 16GB options and half of the 40 are gone; wipe out T-Mobile and Sprint and sim-free and you've wipled out, what, a third or more of the rest? Wipe out the least popular colors...
So any given individual has a poor chance of finding the model he wants in stock, as he is very likely to want one of the in-demand models. But an analyst checking in at an Apple Store might just ask if they have any in stock. "Yes, lots."
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It's rather amazing how well the 5C managed to sell despite how thoroughly unappealing it was unlike the SE.
The 5c was way more appealing, design-wise, than the SE. Not tech-wise, of course. I passed on the 6 and 6S because I did not like the size, did not like the design, and figured that the tech would soon come to a 4" phone (and for a while there, early rumors suggested a 6c was on the horizon). But I would have traded off the size and even some of the tech we did get for a 5c-like enclosure, I like it that much. If we had gotten a 4.7", A8-based phone with Touch ID and Apple Pay, I might have preferred that over the SE we got.