If a letter or email references a list or a tax you do not recognize, contact the City of Saskatoon's assessment office directly using contact information you look up independently, rather than a number or link provided in the notice itself, since that is also how fraudulent notices get answered convincingly.
What is worth checking for real is your actual assessment, since a dispute over assessed value goes to the Board of Revision, and confirming your assessment is accurate protects you against a genuinely higher property tax bill in a way that responding to an imaginary list does not.
A quick call to the City of Saskatoon settles it faster than worrying about a program that does not apply here. Get your hand-reviewed valuation from Joel Dyck.