It does say overseas: Page 1, Note #1.
If your spouse is overseas, Form I-130A must still be completed, but your spouse does not have to sign Form I-130A. Form I-130A must be submitted with Form I-130.
https://www.uscis.gov/sites/default/files/document/forms/i-130instr.pdf
However, Canada is overseas definitely, because it's a foreign country. Blame some English words that don't make sense sometimes. I forgot where the State of Rhode Island is actually an Island.