I am pretty sure the limitation is still in effect
No, it hasn't been for a long time now. It was only in effect until engines were fitted with a de-ice mod in the engine splitter. That mod was mandatory every time an engine was stripped, and there was a time limit. The last one would have been done quite a few years ago now.
From memory, there were quite a few issues surrounding that event, and the crew were at least partly to blame for what happened. There is a pretty good instructional video about it, that was made by the airline after the event.