I dont know on what basis these warheads are deemed non functional and the article doesn’t say.
If they are simply over-aged and deemed unusable, and not somehow dismantled, the Ukrainians may just use them as is. The Canadians may be too picky but the Ukrainians probably aren’t. Both sides have long been using overaged ammo from disparate sources.
I don’t think the article said the warheads were nonfunctional and neither did I FWIW.
It did say that out of the 80,000 rockets only 8,000 had warheads.