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In a model with interactions, the interpretation of the IndVar1 term is not 'the effect' of IndVar1, or even 'the association', since the whole point of the interaction is that the association of IndVar1 with the outcome is different for different value of IndVar2.
So, what is it? Well, for Type III sums of squares, it's the estimated association at the ...
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I'd say that (a) a self-study tag is missing, because that claim actually is an exercise :) (b) you should take another path.
Dobson (2nd ed.) & Barnett (3rd ed.) say: "Using the results of Exercise 1.4 show that..." So my hint is based on that exercise.
In general, $\sum(y_i-\bar{y})^2=\sum y_2^2-2n\bar{y}$. Replacing $y_i$ with $y_i-\mu$, ...
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