I never said you cannot transfer copyright. I said you cannot irrevocably give it up.
And this is true: under US law, after 35 years you can reclaim your copyright
And this is true: under US law, after 35 years you can reclaim your copyright
"It is well settled that rights gained under the Copyright Act may be abandoned."
https://casetext.com/case/micro-star-v-formgen-inc
As for reclaiming a transferred copyright, it's possible, but complicated. It also takes at least 35 years, which is likely too long to be of practical use to most folks.