Removal of Jetpack OG Tags from old blog site

The site above does not use Jetpack’s Open Graph Meta Tags. It uses Yoast SEO’s own tags. In fact, on any site, if you use the Yoast SEO plugin and have activated the Open Graph meta tags under SEO > Social > Facebook, Jetpack’s own Open Graph Meta Tags will never be added. Only the tags from Yoast will appear on your site. The 2 plugins are built to work well together, so you have no risk of having a duplicate set of tags if you use the 2 plugins together, and you do not need to add any code snippets.

That said, Facebook does cache information about each page on your site, so it is possible that even after you update Open Graph Meta Tags on a site, the old title / description / image is still used when sharing links on Facebook because you are seeing cached data. You can refresh that cache manually by using Facebook’s Debug tool:
https://developers.facebook.com/tools/debug/
You can click on “Scape again” there to refresh the data.