You cited from the CRA website correctly - if you voluntarily entered into a remote arrangement with your employer (which is what you did), then the CRA considers you to have been required to work from home for 2023. As long as other eligibility criteria are met, you can claim employment expenses on your tax return.
Keep in mind that you don't need to submit T2200 with your tax return, but you need to have it in case the CRA wants to see it later.
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