Literally the abstract of that very study:

> Only 12.1% correctly answered ≥4 of 5 knowledge questions about the MAID law; only 19.2% knew terminal illness is not required and 20.2% knew treatment refusal is compatible with eligibility. 73.3% of participants expressed support for the MAID law in general, matching a nationally representative poll that used the same question. 40.4% of respondents supported MAID for mental illnesses. Support for MAID in the scenarios depicting refusal or lack of access to treatment ranged from 23.2% (lack of access in medical condition) to 32.0% (treatment refusal in medical illness)

Most Canadians express support for MAID but cannot correctly answer questions about it. When Canadians are actually told what's in MAID, they oppose it.

It's also worth noting that quite a lot of polling on this question is done by, or on behalf of, pro-euthanasia organisations; there is often a huge mismatch between the questions asked and the actual legislation proposed and passed (in a very motte-and-bailey kind of way).

People stated they supported the policy after reading a full description of the policy. If you don't trust the paper (whose researchers are anti-euthanasia), the Canadian government found the same results. https://researchco.ca/2023/05/05/maid-canada-2023/

Nobody ever correctly answers questions about legislation, to put it glibly. Any piece of legislation newer than 10 years and more complex than a sentence is not going to pass such a test with the general public. 19.2% knew that terminal illness is not required? I would be shocked if 19.2% could correctly answer a few basic questions about the definition of "terminal illness."