Yes I agree the statement in the blog is unamibiguous, and it is correct, but I appreciate it might not be clear to you if English is not your first language so let me break it down for you:
If you've already purchased a theme on Gantry 4, or have an existing (current) membership, the new Gantry 5 version will be available in the downloads page at no additional charge.
If you look at your membership purchase you have not "purchased a theme on Gantry 4" for Chimera (only Chapelco for Joomla and Chapelco for phpBB). Also, your don't have "an existing (current) membership" of the Joomla template club. Therefore, you are not entitled to download the latest "Chimera" template (for Gantry 4 or Gantry 5).
There are two ways to get a template, you either purchase a template under the "individual purchase - lifetime" plan which enables you to download that single template for the lifetime of that product, OR, you purchase a "club membership" which enables you to download ANY template for that CMS but only for the duration of that membership. Your club membership has expired and you have not purchased the "lifetime" subscription to "Chimera".
So, I hope that is now clearer to you, the truth was stated and there are no lies.