Tbh a lot of what has been listed on the screenshots you uploaded is stuff I would always expect to see in older properties, but this particular one seems to have a disproportionately high number of things that need doing to it. You might have a survey done and get maybe six items - idk - folks who have bought old places can probably guide you.
But yeah. If I had to pluck a figure out of the air, I'd say you might need to spend half of what you are paying for it in repairs - over the years.
The thing I noted is that the surveyor doesn't say any of these need doing immediately.
I've only had one survey, they were rated red, green and orange, which was a helpful system.
I think you need to hold off spending any more money progressing the sale and talk to him when he's back from holiday. He needs to tell you what needs doing and within what timeframes.
'If this were your single daughter on [my salary and no other financial means] buying this, with no DIY experience and nobody to help, who intended to live there for X number of years, would you tell your daughter to buy it or walk away'?
That's what I'd be asking him.
If I didn't have any personal experience of absolute desperation re: buying and dreadful house shares, I'd be telling you just to walk away from it.
But, I think you need to be convinced you have done your utmost to get away from that setup before your brain will let you move on from this purchase and hold out for the next - less onerous - potential purchase.