Yea, just forget about the step that I showed you earlier… You do not need to retarget it from UE4 to UE5 skeleton. Just Replace Skeleton for all of the animations from the UE4 mannequin that comes with the animations to the UE4 mannequin that is default by Epic (I showed you how in a post above).
Then open the RTG_metahuman and this is how the setup is supposed to look like (I only have a few animations from the pack there, since I replaced the skeleton for just a few of them)
Everything must work for you then