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To remove “Joomla SEF URLs by Artio” in your page, download this necessary file using ftp:
/components/com_sef/joomsef.php
then use an editor to open the file then comment line 1771 and 1772
line 1771 and 1772 looks like this

 if (JRequest::$cosi('fo'.'rmat') != 'r'.'aw')
    $doc->$cache($cacheBuf . base64_decode($cacheBuf2), 'component');

So this will look like this now

/*
 if (JRequest::$cosi('fo'.'rmat') != 'r'.'aw')
    $doc->$cache($cacheBuf . base64_decode($cacheBuf2), 'component');
*/

or

// if (JRequest::$cosi('fo'.'rmat') != 'r'.'aw')
//    $doc->$cache($cacheBuf . base64_decode($cacheBuf2), 'component');

So, what joomsef did is, they encoded the link into base 64 format then decoded
it when displayed in the page.

Other versions:
search for:

        if (JRequest::getCmd('format') != 'raw')
        $doc->setBuffer($cacheBuf . $cacheBuf2, 'component');

replace with

        //if (JRequest::getCmd('format') != 'raw')
        //$doc->setBuffer($cacheBuf . $cacheBuf2, 'component');

so this is it! Good luck.