It looks like that can trigger the same thing. He gets listed as a partial owner and that portion of the property triggers CG tax now (now if it was 50% owner, he could dodge the higher CG tax bracket by spreading the gift over two years with 50% each year).
"To save and defer capital gains tax, you could add your children to the deed, making them co-owners of the property. If the property value has gone up, it would trigger a capital gain on the portion of the cottage that your children now own (at fair market value), and you would pay the tax on that now."
EDIT:
There is a way around this for the future but it won't work now. Consult your tax accountant. Have a corporation that owns the cottage. When you want to sell the cottage, don't. You want to sell the corporation that owns the cottage. There should be no capital gains (or land transfer tax) as there was no ownership change on the property. It is still owned by the same corp. It can be harder to find a buyer as they won't be able to get a mortgage to purchase the corporation. Rules have gotten more complicated recently but in the past, you might have been able to use the small business exemption to get ~800K tax-free out of the sale of the corporation (for every owner so MP and his wife could get 800k each). I think the rules around passive income at corps have made this harder.