If departure from Canada was PRIOR to the Global Affairs Canada travel advisory, medical insurance would not be impacted by the advisory.
If departure was AFTER the Global Affairs Canada travel advisory, medical expenses unrelated to the travel advisory (COVID-19) would be eligible for coverage according to the terms and conditions of the policy. COVID-19 related claims would not be covered.
Please note, if your policy is set to expire, you will need to speak with your travel insurance professional as an extension or top up coverage may not offer coverage for COVID-19 related expenses.