I have sweeped wallets using Blockchain.info previously but never used this method before.
The issue with this is you must enter your private key in to a live website (and a very sketchy one at that). I definitely wouldn't recommend doing this,
especially with a significant amount of coins.
I will likely test this method on on a small amount of satoshis first.
A smart idea.
Does this method also mean that I do not have to sweep the total balance of bitcoins out the paper wallet?
It depends. Is your paper wallet an individual private key, or is it a seed phrase?
If it is an individual private key, then it is generally good practice to sweep the entire amount. An individual private key will only generate a single address, so if you do not sweep it all one of two things will happen. What should happen is that your change is returned to the same address, which means you still have your coins but it is bad for your privacy. What has happened to some users in the past is that their wallet has generated a new address to send the change back to without them realizing, which they haven't backed up and have then lost access to their change.
If your paper wallet is a seed phrase, then you do not need to sweep the entire amount. The wallet will automatically send the change to a brand new change address generated from your seed phrase, which you can then recover again at a later date.
Yes it's a private key. What I'll most likely do is transfer the complete ammount then to play it safe. 👍