Nothing in his post suggests he doesn't know how transactions take place. It seems that you have skimmed his thread in order to make a post as fast as possible that seems like it contributes something.
His question is whether the Lightning Network, which is a protocol on top of the blockchain, enables Bitcoin to have fast payments like XRP does right now. The fact that there's 10 minutes between blocks is irrelevant to this question.
To the OP: The answer right now is not really. LN support is not amazing, and there isn't really complete consensus on whether it goes far enough or not.
What do you mean by fast transactions? Did you mean about having a fast transaction by speed? If that's the case then I would probably says that it is depends on the exchangers because there are exchangers that also have a fast transactions almost the same to all of the coins that they have and there is also some exchangers that is so slow to have transactions compared to other coins. If you mean is about the transaction fees, then it would be more efficient if we will use ripple or xrp to have transaction fees because they are more efficient and affordable as it is very low fees compared to other transaction fees of coins like bitcoin and etc.
Another person who definitely didn't read the OP.