Does anybody know what flower cutter, this is please?
Don't see a picture of cutter you are talking about? Post a picture and I am sure someone here will be able to answer you.
The tutorial is for a daffodil, but my friend said the cutter is for another flower?
It's a stephanotis cutter.
A stephanotis cutter has 5 petals, not 6. That is, indeed, the Stephen Benison daffodil cutter.