Are the KYC addresses listed in the blogpost (https://blog.iota.org/claims-and-reclaims-finalization-e692844c505a) the old addresses of the old seeds or the new addresses of the new seeds where the foundation should send the tokens in this reclaim process?

This is important to know because afaik there's no way to know what your old addresses with the old seeds were anymore unless you for some reason had written them down somewhere.