Situation is this
2005 TypeS DC5 k20a3 Engine
Stage 1 Clutch Kit, lightweight flywheel - ClutchInd

Had a thrust washer failure doing about 5km/hr
Mechanic initially had no clue so advised to take home and bring back next day. So drove another 1.5km with a stopstart grind, not exceeding 30km/ph - slight crunch-unhappiness

The question much scoring do you think will have occured?

Yes, im aware the specific info won't be known until engine completely removed. But it will help with sourcing a new block from East Coast or US.

Mechanic is an idiot to be honest - so sending the car to someone who understands Honda Engines