This is fine, and is far less annoying to do. There are no known flaws in that approach, when it’s available. However, as noted in the article, their focus here

This is fine, and is far less annoying to do. There are no known flaws in that approach, when it’s available. However, as noted in the article, their focus here is exclusively on destroying data when the device is unresponsive and cannot invoke a secure enclave wipe through software means.