Does anyone know the amount of the settlement?
Yes, and they will remain the only ones who will know-confidentiality will be included in the settlement agreement.
If anyone on SJU's side is worth 2 cents the settlement will be considerably less than the full amount and in return Slice can seek employment immediately. The leverage they had is that if Slice wanted the full amount, they could have kept him in their employ (contractually only) for six years or at least prohibited him working elsewhere, at which time his future career would be severely compromised.
Do you know that negotiations were concluded. An announcement that he doesn't work at SJU anymore doesn't mean they've settled, simply that he won't be back, which we all knew.