To be honest anyone who has ever flown the 777 will have a bit of sympathy for the 777 nose gear as, during a normal touchdown, the spoiler deployment coupled with the selection of reverse thrust can slam the poor old nose gear into the contrete requiring a good old pull back to prevent First Class being buried!
In this situation I can only summise that with the spoilers up and the reversers deployed the pilot must have had to have the column in his lap to get a rotation rate, as the reversers stow, the spoilers drop and full power comes back on that pitch rotation rate would be dramatically increased leading to the tail scrape. All probably happening at relatively slow aerodynaminc airspeeds.
One would assume that this will result in a 'no tea, no biscuits' stand up chat with the management. Bring your hat!