I think on recent XOA we even switched to systemd-timesyncd. Pinging @thomas-dkmt so he can update the doc to fix it (only the new doc directly! oh and you can ask @julien-f for details if needed, thanks!).
Thanks. The problem is taht we dont have a NFS datastore to use. So we had to do export/import.
you can migrate without a NFS datastore, but on esxi 6.5+ , you'll need to shutdown the VM before starting the migration
and with vsan there is an additionnal , slower steps : extractig the vmdk to a Remote (in XO )