What is that reduce the number of transactions? you can't stop people from transacting, segwit does it by reducing the size of the data included in each block. who opens channels in LN?
Probably he is talking about the reduced of unconfirmed transaction once SegWit is implemented. I believe that is the purpose of Segwit, to establish the fix for bitcoin scalability if I am not mistaken. It gives way to Lightning Network that will greatly help in the transaction.