"6-Week-Old" babies don't have the muscle strength to hold their heads horizontally like that (and IMHO it would be foolhardy to wave them around like that)...

Pronounced social smiling (as in the video) already by six weeks would also pretty unusual.

Hah yes, many years I got into a debate with someone here or was it Reddit about the "intuitiveness of iOS" and someone claiming "I've handed my iPad to my 3 month old and they are able to swipe and navigate"...

No, your baby typically needs to be propped up to sit at that age. They simply don't have that fine motor control and coordination, let alone the comprehension of whatever app you put in front of them.