I think it is more than "optimistic," I think it has to be wrong to say there will be no impact.Sukhoi's claim that the fire won't affect the testing schedule is rather optimistic.
This is their latest prototype. Which would mean they have incorporated things they learned in earlier phases.
When that flying prototype is damaged by a fire like this, they will have to determine what caused this fire before they continue with their latest "version," testing.
Now, will they continue testing ealrier prototypes? Yes.
Will they continue building the even newer aircaft? Probably in areas clearly not associated with the fire...but you can bet they will want to find out what caused this and make sure they fix it.
They will be anxious to determine the cause of this fire so if there is anything related to the newest version they can fix it and ensure it does not carry forward to the even newer aircraft.
Oh...there will be an impact...no doubt. At least until they determine what caused the fire and fix anything they may have to fix to prevent it in the future.
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