It seems, though, that a partial unloading is being considered by a professional in the field according to quotes in an article in The Guardian [1]:
However, Peter Berdowski, CEO of Boskalis, a specialist dredging company that has sent a crew to the scene, said data so far suggested “it is not really possible to pull it loose” and that the ship may need to be unloaded. “We can’t exclude it might take weeks, depending on the situation,” Berdowski told Dutch television.
He said the ship’s bow and stern had been lifted up against either side of the canal. “It’s like an enormous beached whale. It’s an enormous weight on the sand. We might have to work with a combination of reducing the weight by removing containers, oil and water from the ship, tugboats and dredging of sand.”
[1] https://www.theguardian.com/world/2021/mar/25/suez-canal-blo...