Perhaps I was not clear. The goal is to get the coins from point A to Point B without a trace. Do I have to spell it out any more clearly?? Lol.
Yes, please, because if point A to point B to you means this:
...from a ledger wallet to a different ledger wallet...
...from ledger A to ledger B...
then using your seed is enough. However, strictly speaking, you are not actually sending your coins from Ledger A to Ledger B. Your coins are not in your Ledger device, after all.
But if you aren't clear enough and actually meant that you really want to move your coins, then I guess you cannot have a Bitcoin transaction without a single trace left even if you use a tumbler. After all, your first step would be to send the coins from your wallet to a tumbler's address. Bitcoin is using a public ledger. All transactions are available to the public.