Thank you, got it now! I think he might have been clearer if he'd said "To represent a NUL byte without any physical NUL bytes, we don't discard the indicator

Thank you, got it now! I think he might have been clearer if he'd said "To represent a NUL byte without any physical NUL bytes, we don't discard the indicators and instead treat it like a character above ASCII, which must be a minimum two bytes long 11000000 10000000 => hexadecimal C0 80."