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The method I have linked does not manually generate hardware wallet or seed phrase.
The electrum wallet generates your cold wallet seed phrase in exactly the same manner as it would when creating a hot wallet.
One of the things that bothers me about HW promoters like the one in your video is they are promoting ignorance and dependency upon third party devices. In contrast learning how to build your own cold storage eliminates such dependency and educates the user for a lifetime of secure self sovereign bitcoin storage. It is not a difficult process to learn.
This widespread defaulting to the 'ease' of HWs is simply laziness, imo. No doubt HW touts are active on social media as well pushing their narrative.