It appears the assignment includes a requirement for the appraiser to develop an opinion of value for the property in it's current condition, aka "as is". There are basically two ways to do this for a property that needs repairs of completion of proposed construction or a proposed remodel.
1 - the appraiser can attempt to find and use other properties which are in the same condition and require the same amount of work for completion. So for example if the subject was in beater condition and is being proposed for a major remodel, the comparables most closely indicating to its "as is" value would be other properties in similar condition. The challenge with such properties - which includes your current situation - is that there are seldom enough such sales to develop this type of analysis. In your case it would usually be almost impossible to find several sales, each needing ~$10k in repairs or upgrades. So due to the lack of relevant data this tends to be the approach less commonly developed.
2- the other, far more commonly used approach is the one used in this analysis. The appraiser identifies sales involving properties that are in that finished condition and then backs out the discount that's applicable for this current condition. Meaning, if the property was finished it would be worth the "As Is" + $8500 more.
Where I would take issue with the example given above is that the actual discount for a property needing another $8500 in hard costs (labor+materials) to complete would normally be far in excess of the $8500. All real estate is local so what applies in my area might not be the same as what applies in your area, but in our region that discount would be closer to $15,000, not $8500. It would include the hard costs but also include some incentive or profit margin, sufficient to prompt a buyer to undertake this "needs-work" property instead of a similar property that's already finished. Most investors don't work for free, or undertake the uncertainty of an incomplete remodel project for the break-even.
Another angle in the example given is how much rent loss will be incurred whilst waiting for completion of the project and however long it takes to get a tenant in. Thats not an issue with properties needing only minor repair but it can add up when the construction or remodel is anticipated to take months to complete.