Re: Not unusual
"We don't know what their schedule consists of or what their arrangements are (at least I don't)"
I don't know the specifics, but I don't think it's that hard to connect Musk's vague statement of "long hours at high intensity" and the fact that they brought in beds to arrive at a rather grim picture.
"They might be putting in more hours and getting paid more"
They might, but I'm pretty sure they're not getting paid more, given how eager management have been to fire everyone else. These workers are mostly earning salaries, which means no overtime. I haven't seen any reports of a round of raises or bonuses. Have you?
"they might be working more productively,": I wouldn't count on that. Denying people work-life balance tends not to end that way.
"or they might be accumulating their time off and taking longer weekends,": Again, salaried workers don't get time off in compensation for long hours. I'm sure they are saving up what they normally get because they have no other choice, at least until the company switches to a model where they can no longer accumulate any (just a prediction, as I haven't heard them plan this yet).
"And if they are putting in more hours, they must have some incentive to do so, otherwise why would you do it?"
I don't expect many to keep doing it for long. As for why you would do it, you would do it if the job is necessary for something you rely on until such a time as you get another, hence why many of the employees are on visas that make it difficult to simply switch jobs.
"I'm sure you wouldn't mind offering appropriate references to back up these assertions:"
It's not like every plan of Musk's is fully documented in public. Most of it has been leaked in vague terms. I can't give you a direct citation for each thing, and you know that well.
* That's not why the beds are there
Derived from the demand for long hours, which is compatible with having someone working all day and sleeping at the office to make sure they're working when they would have been commuting, but less compatible with letting employees take a nap during a normal work day.
* They're there because Musk thinks coding volume is his problem
Musk wants developers to work much harder than they are because he thinks that will solve problems. This despite the fact that Twitter's problems are not due to missing features or the like. It's pretty clear he doesn't have a great understanding of what caused Twitter not to make a large profit, as focusing on things that generate revenue would do more than insisting on more code written.
* doesn't care about the long-term viability of the people he wants to build the systems
Long hours at high intensity does bad things to people. It's called burn out. Anyone who actually goes along with the demands for a long time is likely to find this out. He has the intelligence necessary to understand this relatively basic concept, but he doesn't care.