Is this true?
Let $f:E\xrightarrow{}\mathbb{C}$ be holomorphic on the interior of a compact set $E$, and let $\varepsilon>0.$
If $|f|<\varepsilon$ on $E$, then $$\frac{1}{\pi}\int_E \frac{|f(w)|}{|z-w|} dm(w)<\varepsilon$$ for $z\in E$, where $m$ is the two-dimensional Lebesgue measure.
Important edit: $E$ is COMPACT.
Less than $\epsilon$ looks very unreasonable. If $E$ is the closed unit disk, $w=0$ and $f(x)=\epsilon /2$ for all $x$ then the left side is $\pi \epsilon $ which is greater than $\epsilon$.