That is one sad looking board

At 25 % extra weight, has it been repaired with concrete ?

It looks to me it's been totally water logged , softened all over , delaminated and then used a lot . The nose is the least of your worries . It's the sides at the mast box that looks to be crushed from uphauling and then just filled with bog that looks nasty . And the injecting resin in other soft spots is also not a good sign .
To repair this properly would be a huge effort , probably at least removing most of the deck and rebuilding.
The time , money and skills involved to do this , it would be better to build a new board .
Id say it's totally stuffed and not worth fixing .
Its going to be a problematic nightmare .
Sorry