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Local station is also reporting that the longer runway was recently re paved. In the process they extended the *other* end, and blocked off the taxiway going to the far end of the longer runway (22), converting the excess to pure "overrun"/buffer. Apparently partly to move the end of the runway away from the road. Understandable if more jets are flying from there than previously and/or the road now carries more traffic. That could contribute to confustion, instead of continuing straight at the end of 26, they now have to make a left turn to a different taxiway leading to the new departure end of 22).

FWIW, 26 the GA runway, is about 3-4 times as wide as 22. Not an excuse of course, but a bit of an explanation. Changes made within the last week or two.

Possibly the crew or the Captain had not flown from there since the changes. But that would seem to make it more likely that he'd taxi onto the now closed taxiway. However all it took was for him to turn a little too tight onto 26 instead of onto the other taxiway. Get confused, not notice you should have made one more turn, and think you are on the proper runway, and you and 48 other people are dead, and your first officer is clinging to life.

FWIW, 26 the GA runway, is about 3-4 times as wide as 22

I had a look at the airport on Google Earth. The usable width of 26 is 75ft, but the concrete width is 150ft. In other words, the runway is 150ft wide, but is painted to be 75ft wide. Just a possible source of confusion.