Copied from the catalogue

"For best flowering, grow under Cattleya conditions. These will yellow and drop their leaves at the end of the season which is normal. Reduce watering while leafless and resume normal watering and fertilizing at the onset of new growth in the spring. "

I do not think this is beginner's orchid because the extent of the winter drier period is difficult to judge.

As for the leaves maybe they are showing signs of normal dying as described in the nursery blurb.