Polak this is in absolutely no way your fault. If a sink can't hold it's capacity in water it is a failure of the installation and nothing more. Straps should have been installed for added security, smooth stainless steel is not the best surface for adhesive but it should have held if done properly.
The picture above with the screws, I would argue those are not for support but to keep the sink in place while the adhesive sets. They add a touch of security but I doubt that is why they are there.
I don't have much advice on what you should do but I would make an insurance claim and let them deal with liability. They should be on your side and going after the home builder and their sub.
If you get stuck, consider changing the flooring in just the affected area to tile, that way you don't need to match the cork throughout. Cork/wood products are not the best choice for kitchens as there is always water spilling/dripping on them. You could have just a easily spilt a pot of boiling water on that floor and ruined it. Or, like my wife did, a mop bucket on hardwood!
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