Understood. This explains a lot.
So rolling back the chain to a much earlier state allows someone who still has access to these old wallets to spend them now in the new fork.
Completely negating any newer transactions that were done before.

Which probably explains why these so called "dormant" wallets has become active again.
I made a post about it recently on X.
https://x.com/ZachZwei/status/1872301134813237399
The scary thing is, this unknown user seems to have access to multiple wallets.
Distributed some old coins to new addresses.
The LKY revivers seems to promote that it was the og dev "LuckyC" is in control of this wallets.
What do you think?

Also, I was experimenting with the og LKY client v1.0.1 and saw a bootstrap.dat file which was still downloadable.
Ran the clien with it, and it is syncing way past this so called "revival".
Currently at  block 537269, dated March 19, 2015.

Posted about it too to highlight the fact that the og chain is still downloadable and syncing.
https://x.com/ZachZwei/status/1872675313156849960