Yeah this "teardown" is not recent either. I think it has been discussed before on this forum.
It's obvious the guy doesn't understand basic electricity.
Now whether the power supply inside the lamp for the 5G unit is really oversized remains to be checked. But if it is, it may just be for cost reasons: might just have been cheaper than a lower power one, especially if the company uses it in many different products. Just a numbers problem.
If that's the case, one could still make the point that a largely oversized power supply is likely not to be as efficient as a properly sized one for a given power draw. If you use say a 100W mains power supply for powering a 1W circuit, its efficiency is not going to be spectacularly high, which in itself would be a bad engineering decision. Just an additional thought: whereas the guy says BS, his teardown may still show an engineering issue related to power efficiency.