This only works if the swapped vehicle is a vw with a diesel option in Canada. A more involved swap to a non stock vehicle will require the fuel change form.For future reference, this is how its done.
Do not tell anyone from the MTO a long story about how great and handy you are at swapping engines or your nobility in preserving emissions equipment. Don't even ask them questions. Tell the drones at the service Ontario office that you need the fuel type switched, nothing else.
Give them minimal information and you will have minimal problems.
Dimitry has initiated a process that he is unlikely to get out of. Once you upset the MTO it is like being fed into a wood chipper. You are not getting out, it is a fully automatic machine. Let that be a lesson for the rest of us.