An ACTED tutor might be better placed to answer this, but...
I think the notes are just trying to say IF the cost of capital is NOT factored into asset share, then the difference between claim and asset share not not the same as the profit or loss to the shareholders.
Generally speaking Asset Share is the level of assets owned by the policy holder.
Shareholders provide capital to cover any short fall between reserves needed to support the policy and the asset share.
The return required by the shareholders, i.e. the cost of capital, is a deduction to the asset share.
{ [ (AssetShare t=1) + (Premium @t=1) ] * [1+InvestmentReturns(t1 to t2] } - Cost of Capital = AssetShare t=2
So for example:
asset share (t=1) = 1,000
reserves required = 1,200
shareholder capital = 200
cost of capital 5% (ie 10)
ignoring any premiums, investment returns etc. then
asset share (t=2) = 1,000 - 10 = 990
claim (t=2) = 1,100
thus [claim] - [asset share] = 1,100 - 990 = 110
pre claim share holder assets (t=2) = 210 (prior to claim, i.e. 200+5%)
post claim share holder assets (t=2) = 210 - 110 = 100 (i.e. after claim a loss of 110)
I think the two sentences you refer to in the notes, means that if the calculation of [claim] - [asset share] ignores cost of capital then we would just have 1,100 - 1,000 = 100, however this is not the actual loss to share holders. They lose the 100, but also the 10 they were expected to gain from supplying 200 in capital. So their actual loss is 110, not 100.