I have actually never heard of surgeons not being able to do an ileostomy. You'd think it would be the other way around - that the surgeons couldn't do a pouch. My only guess is that perhaps the surgeon constructed the pouch, but there was not enough ileum to do a proper loop (perhaps it was too high up, which would result in short bowel syndrome). Either that, or if there have been multiple previous surgeries, there may have been excess scar tissue which prevented a proper exit for the stoma.
Regardless, it does sound somewhat unusual. I would be curious to find out the reasoning.
As for one steps in general, though, while still not as common as the 2 step, these are being done all the time. There are varying opinions as to the pros and cons, and since I'm not an expert on that, I won't weigh in on it--though of course, one obvious benefit of a one step is not having to bother with the temporary ileo. I will also say that my own surgeon says he would not do a one step, simply because he feels strongly that the pouch must be given a good 3-6 months to heal. But as I said, many people on this forum have done one steps are are doing just fine.
The "nose tube" is mostly likely an NG tube. Very common after surgery. It's used to drain the stomach in order to allow the bowel complete rest.
