Hello! Thank you for this report.
After further inspection, Yoast Premium doesn’t support redirection as post metadata for years now — their API docs must be outdated, and I’ll remove that mention from our Transport extension in the next update.
So, this means that your redirects are still stored with Yoast SEO Premium.
TSF uses a different method for redirection: It handles this on a per-post basis, which limits the amount of data processed. Yet, if you wish to manage redirects as Yoast SEO Premium does, check out the freely available Redirection plugin: https://www.ads-software.com/plugins/redirection/.
To transport your redirects from Yoast SEO Premium to the Redirection plugin, you must first export the redirects by going to “Yoast SEO > Tools > Import and Export > Export Redirects” and hitting “Export redirects;” this will give you a CSV file. Then, at “Tools > Redirection > Import/Export,” you can import Yoast SEO’s redirects by uploading that CSV file.
You can run Redirection and The SEO Framework alongside each other, where Redirection will maintain your old redirects.
I hope this helps. Cheers!