<p>That is a FALSE statement.
Scantron is able to pick up marks from pencils of different strengths.</p>
<p>Unless the SAT scantrons are specially made so they don’t accept anything other than #2 strength pencils so they can penalize anyone who used pencils other than #2, you are fine.</p>
<p>(In school scantrons I usually use lead mechanical pencil of all sorts of strength and scantrons are always fine with them)</p>