If you follow it exactly yes its fine cause you're adding to thw already very good randomness of the device.

The problem is people that see something like this, where Matt does <10 rolls and then stumble across the feature on device that allows them to create a seed from scratch (no device entropy).

If they don't do enough rolls in that process and are running the old device and/or firmware without the minimum roll enforcement, they create a shitty seed and 'money gone'.

Link me please and I'll check

You can do that or generate from scratch with no additional entropy.