I have some doubts to him pointing at the tyres.
They provide grip or they don't, that's all there is to them. Him being slow doesn't seem to be the tyres fault.
Clearly he's very fast on asphalt, as we saw from Canarias. He can't have just forgotten how to drive on gravel, it must be the balance and the set up of the hybridless + Hankook tyres. Others adapted better, Kalle and Neuville not so much...
Piastri dominates the Sprint Pole. 1. Piastri 2. Max 3. Norris 4. Leclerc 5. Ocon 6. Sainz
Race 13 - Belgium GP