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I have been involved with search engine optimization since 1998 and have never seen or heard of any negative consequence of doing what you are doing (as far as search engines are concerned).

However, if you are only concerned about showing links in a sidebar widget you could use a TEXT or LINKS widget and just manually update the list of links as required. That would be more consistent with the way WordPress is intended for use.

It’s really just a business decision, not an SEO decision.

The comic is a GIF file and there isn’t much code associated with it. I would guess some sort of plugin is being used to serve images from the media library. My guess is that site uses the ComicPress plugin.

WordPress Address (URL): http://primarydomain.com
Site Address (URL): http://addondomain.com

That may come back to haunt you. You should be using the same domain in both settings. This setting may expose you to an eventual problem with duplicate content.

Use PHPMyAdmin to reset your account’s administrator status.

In the USERMETA table change the META_VALUE field for “capabilities” to say
a:1:{s:13:"administrator";b:1;}

Start by changing your hosting account passwords. And check to make sure that your hosting account email has not been changed.

It’s rude and misleading to change the publication dates on posts. Other than annoying regular readers of your site who may not appreciate being fooled like that, however, there is no downside to watch out for.

It sounds like you are following SEO blogger advice to create everfake content. If it were truly evergreen it would receive traffic on a continual basis and you would never be tempted to engage in such fakery.

Dates in the URLs are a GOOD thing, not a bad thing.

That screen capture only shows one table in your SQL database. You had to click down to that table in the database tree to see this page. Just go up one level in the tree (on the left side of the page).

The problem is the way CPANEL manages addon domains. You should never have used the subdomain. Instead you should only have used the addon domain name.

Modern CPANEL installations will redirect the subdomain.primarydomain.tld to your addondomain.tld through an .htaccess redirect (this is managed through the CPANEL menu).

You can add code to the .htaccess file to also redirect the priamarydomain.tld/addondomain folder to the addondomain.tld so that for all intents and purposes your Website is operating as a standalone domain.

If you have the option of installing the addon domain in its own directory tree that is preferable but not every Webhost allows that.

The SQL database may now have the wrong sub/domain information in some of the settings. You can try using PHPMyAdmin to look for the wrong domain root to resolve the problem or you can try reinstalling WordPress and just using one domain name.