So this article never really ends up indicating how the user was able to resolve the issue.
I was able to add HSTS to the Nexus SSL Port of my application by adding a rewrite.xml to the list of .xml files that the application was calling for and inside of the rewrite.xml I added the following jetty connectors.
<Configure id="Server" class="org.eclipse.jetty.server.Server">
<!-- =========================================================== -->
<!-- configure rewrite handler -->
<!-- =========================================================== -->
<Get id="oldhandler" name="handler"/>
<Set name="handler">
<New id="Rewrite" class="org.eclipse.jetty.rewrite.handler.RewriteHandler">
<Set name="handler"><Ref id="oldhandler"/></Set>
<Set name="rewriteRequestURI">true</Set>
<Set name="rewritePathInfo">true</Set>
<Set name="originalPathAttribute">requestedPath</Set>
<Call name="addRule">
<Arg>
<New class="org.eclipse.jetty.rewrite.handler.HeaderPatternRule">
<Set name="pattern">/*</Set>
<Set name="name">Strict-Transport-Security</Set>
<Set name="value">max-age=31536000; includeSubDomains</Set>
</New>
</Arg>
</Call>
</New>
</Set>
</Configure>