I would guess the computer is a sealed component. On top of that I would rather have a submerged bike that a salt weathered one. The ECU is sealed, as is most of the engine. Any water ingress into the oiled engine can be changed quite easily. The big bonus I suppose it that nothing would have been moved while the bike was under water and if new it is unlikely to have got in. The only exception to this that I can think of it the steering coulmn. The external pressure may force water into the air void inside. The engine will likely fair well as most of the components exposed to the air/water are not steel and water is unlikely to have entered if the bike was stored upright.
I say this as I capsized a boat in the Amazon many years ago and it was underwater for 5 days. When we recovered it, the Honda 40, despite having been hydrauliced (is that a word ?) and the con rods bent like bananas, the engine had not suffered from the water. The water was mud like as in Queensland.
Of course I could be talking b0ll0x....who knows...

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