Offchain refers to this case of being not on the main chain. LN is an offchain protocol which is also called a second layer solution (bc it on top of the first layer aka the mainnet). There can't be any fake tx bc LN is just a mega large smart contract. Here a video on the LN:
Im sorry for such a late reply @sames
I just realized that I missed bunch of comments lately. Just wanted to thank you for keeping in touch with me.
Hopefully you had a great weekend,
Piotr