from what i see everyone has their own view on this, some say that putting it on a metal plate can be secure, or putting it on a metal bracelet is also safe, or putting the seed phrase in several different places as a backup, etc, so with that i can say that there is no perfect way to secure the seed phrase, what we do is just to secure it, depending on what we choose it still has shortcomings or events that may happen outside of what we expect.
Of course the titanium plate is great, but disasters weird as this should be a concern for saving life first then anything else follows. Losing a home changes a lot in our psychology even there are way more other valuable things to bother about in the house, and looking for a titanium plate can be a strenous activity. It may mix up with other burnt materials in the house, like rubber, though painful, not everyone would be able to find the plate anymore.